diff --git a/docs/data-sources/loadbalancer.md b/docs/data-sources/loadbalancer.md
index c59fc8428..d3c1c4eae 100644
--- a/docs/data-sources/loadbalancer.md
+++ b/docs/data-sources/loadbalancer.md
@@ -33,6 +33,7 @@ data "stackit_loadbalancer" "example" {
 
 ### Read-Only
 
+- `disable_security_group_assignment` (Boolean) If set to true, this will disable the automatic assignment of a security group to the load balancer's targets. This option is primarily used to allow targets that are not within the load balancer's own network or SNA. When this is enabled, you are fully responsible for ensuring network connectivity to the targets, including managing all routing and security group rules manually. This setting cannot be changed after the load balancer is created.
 - `external_address` (String) External Load Balancer IP address where this Load Balancer is exposed.
 - `id` (String) Terraform's internal resource ID. It is structured as "`project_id`","region","`name`".
 - `listeners` (Attributes List) List of all listeners which will accept traffic. Limited to 20. (see [below for nested schema](#nestedatt--listeners))
@@ -40,6 +41,7 @@ data "stackit_loadbalancer" "example" {
 - `options` (Attributes) Defines any optional functionality you want to have enabled on your load balancer. (see [below for nested schema](#nestedatt--options))
 - `plan_id` (String) The service plan ID. If not defined, the default service plan is `p10`. Possible values are: `p10`, `p50`, `p250`, `p750`.
 - `private_address` (String) Transient private Load Balancer IP address. It can change any time.
+- `security_group_id` (String) The ID of the egress security group assigned to the Load Balancer's internal machines. This ID is essential for allowing traffic from the Load Balancer to targets in different networks or STACKIT NETWORK AREAS (SNA). To enable this, create a security group rule for your target VMs and set the `remote_security_group_id` of that rule to this value. This is typically used when `disable_security_group_assignment` is set to `true`.
 - `target_pools` (Attributes List) List of all target pools which will be used in the Load Balancer. Limited to 20. (see [below for nested schema](#nestedatt--target_pools))
 
 <a id="nestedatt--listeners"></a>
diff --git a/docs/resources/loadbalancer.md b/docs/resources/loadbalancer.md
index ab77a41dd..752782155 100644
--- a/docs/resources/loadbalancer.md
+++ b/docs/resources/loadbalancer.md
@@ -110,6 +110,108 @@ resource "stackit_loadbalancer" "example" {
   }
 }
 
+# This example demonstrates an advanced setup where the Load Balancer is in one
+# network and the target server is in another. This requires manual
+# security group configuration using the `disable_security_group_assignment`
+# and `security_group_id` attributes.
+
+# We create two separate networks: one for the load balancer and one for the target.
+resource "stackit_network" "lb_network" {
+  project_id       = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name             = "lb-network-example"
+  ipv4_prefix      = "192.168.1.0/24"
+  ipv4_nameservers = ["8.8.8.8"]
+}
+
+resource "stackit_network" "target_network" {
+  project_id       = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name             = "target-network-example"
+  ipv4_prefix      = "192.168.2.0/24"
+  ipv4_nameservers = ["8.8.8.8"]
+}
+
+resource "stackit_public_ip" "example" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+
+resource "stackit_loadbalancer" "example" {
+  project_id       = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name             = "example-advanced-lb"
+  external_address = stackit_public_ip.example.ip
+
+  # Key setting for manual mode: disables automatic security group handling.
+  disable_security_group_assignment = true
+
+  networks = [{
+    network_id = stackit_network.lb_network.network_id
+    role       = "ROLE_LISTENERS_AND_TARGETS"
+  }]
+
+  listeners = [{
+    port        = 80
+    protocol    = "PROTOCOL_TCP"
+    target_pool = "cross-network-pool"
+  }]
+
+  target_pools = [{
+    name        = "cross-network-pool"
+    target_port = 80
+    targets = [{
+      display_name = stackit_server.example.name
+      ip           = stackit_network_interface.nic.ipv4
+    }]
+  }]
+}
+
+# Create a new security group to be assigned to the target server.
+resource "stackit_security_group" "target_sg" {
+  project_id  = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name        = "target-sg-for-lb-access"
+  description = "Allows ingress traffic from the example load balancer."
+}
+
+# Create a rule to allow traffic FROM the load balancer.
+# This rule uses the computed `security_group_id` of the load balancer.
+resource "stackit_security_group_rule" "allow_lb_ingress" {
+  project_id        = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  security_group_id = stackit_security_group.target_sg.security_group_id
+  direction         = "ingress"
+  protocol = {
+    name = "tcp"
+  }
+
+  # This is the crucial link: it allows traffic from the LB's security group.
+  remote_security_group_id = stackit_loadbalancer.example.security_group_id
+
+  port_range = {
+    min = 80
+    max = 80
+  }
+}
+
+resource "stackit_server" "example" {
+  project_id        = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name              = "example-remote-target"
+  machine_type      = "c1.1"
+  availability_zone = "eu01-1"
+
+  boot_volume = {
+    source_type = "image"
+    source_id   = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+    size        = 10
+  }
+
+  network_interfaces = [
+    stackit_network_interface.nic.network_interface_id
+  ]
+}
+
+resource "stackit_network_interface" "nic" {
+  project_id         = var.project_id
+  network_id         = stackit_network.target_network.network_id
+  security_group_ids = [stackit_security_group.target_sg.security_group_id]
+}
+
 # Only use the import statement, if you want to import an existing loadbalancer
 import {
   to = stackit_loadbalancer.import-example
@@ -130,6 +232,7 @@ import {
 
 ### Optional
 
+- `disable_security_group_assignment` (Boolean) If set to true, this will disable the automatic assignment of a security group to the load balancer's targets. This option is primarily used to allow targets that are not within the load balancer's own network or SNA. When this is enabled, you are fully responsible for ensuring network connectivity to the targets, including managing all routing and security group rules manually. This setting cannot be changed after the load balancer is created.
 - `external_address` (String) External Load Balancer IP address where this Load Balancer is exposed.
 - `options` (Attributes) Defines any optional functionality you want to have enabled on your load balancer. (see [below for nested schema](#nestedatt--options))
 - `plan_id` (String) The service plan ID. If not defined, the default service plan is `p10`. Possible values are: `p10`, `p50`, `p250`, `p750`.
@@ -139,6 +242,7 @@ import {
 
 - `id` (String) Terraform's internal resource ID. It is structured as "`project_id`","region","`name`".
 - `private_address` (String) Transient private Load Balancer IP address. It can change any time.
+- `security_group_id` (String) The ID of the egress security group assigned to the Load Balancer's internal machines. This ID is essential for allowing traffic from the Load Balancer to targets in different networks or STACKIT NETWORK AREAS (SNA). To enable this, create a security group rule for your target VMs and set the `remote_security_group_id` of that rule to this value. This is typically used when `disable_security_group_assignment` is set to `true`.
 
 <a id="nestedatt--listeners"></a>
 ### Nested Schema for `listeners`
diff --git a/examples/resources/stackit_loadbalancer/resource.tf b/examples/resources/stackit_loadbalancer/resource.tf
index fd720c50f..04441957c 100644
--- a/examples/resources/stackit_loadbalancer/resource.tf
+++ b/examples/resources/stackit_loadbalancer/resource.tf
@@ -91,8 +91,110 @@ resource "stackit_loadbalancer" "example" {
   }
 }
 
+# This example demonstrates an advanced setup where the Load Balancer is in one
+# network and the target server is in another. This requires manual
+# security group configuration using the `disable_security_group_assignment`
+# and `security_group_id` attributes.
+
+# We create two separate networks: one for the load balancer and one for the target.
+resource "stackit_network" "lb_network" {
+  project_id       = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name             = "lb-network-example"
+  ipv4_prefix      = "192.168.1.0/24"
+  ipv4_nameservers = ["8.8.8.8"]
+}
+
+resource "stackit_network" "target_network" {
+  project_id       = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name             = "target-network-example"
+  ipv4_prefix      = "192.168.2.0/24"
+  ipv4_nameservers = ["8.8.8.8"]
+}
+
+resource "stackit_public_ip" "example" {
+  project_id = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+}
+
+resource "stackit_loadbalancer" "example" {
+  project_id       = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name             = "example-advanced-lb"
+  external_address = stackit_public_ip.example.ip
+
+  # Key setting for manual mode: disables automatic security group handling.
+  disable_security_group_assignment = true
+
+  networks = [{
+    network_id = stackit_network.lb_network.network_id
+    role       = "ROLE_LISTENERS_AND_TARGETS"
+  }]
+
+  listeners = [{
+    port        = 80
+    protocol    = "PROTOCOL_TCP"
+    target_pool = "cross-network-pool"
+  }]
+
+  target_pools = [{
+    name        = "cross-network-pool"
+    target_port = 80
+    targets = [{
+      display_name = stackit_server.example.name
+      ip           = stackit_network_interface.nic.ipv4
+    }]
+  }]
+}
+
+# Create a new security group to be assigned to the target server.
+resource "stackit_security_group" "target_sg" {
+  project_id  = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name        = "target-sg-for-lb-access"
+  description = "Allows ingress traffic from the example load balancer."
+}
+
+# Create a rule to allow traffic FROM the load balancer.
+# This rule uses the computed `security_group_id` of the load balancer.
+resource "stackit_security_group_rule" "allow_lb_ingress" {
+  project_id        = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  security_group_id = stackit_security_group.target_sg.security_group_id
+  direction         = "ingress"
+  protocol = {
+    name = "tcp"
+  }
+
+  # This is the crucial link: it allows traffic from the LB's security group.
+  remote_security_group_id = stackit_loadbalancer.example.security_group_id
+
+  port_range = {
+    min = 80
+    max = 80
+  }
+}
+
+resource "stackit_server" "example" {
+  project_id        = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+  name              = "example-remote-target"
+  machine_type      = "c1.1"
+  availability_zone = "eu01-1"
+
+  boot_volume = {
+    source_type = "image"
+    source_id   = "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
+    size        = 10
+  }
+
+  network_interfaces = [
+    stackit_network_interface.nic.network_interface_id
+  ]
+}
+
+resource "stackit_network_interface" "nic" {
+  project_id         = var.project_id
+  network_id         = stackit_network.target_network.network_id
+  security_group_ids = [stackit_security_group.target_sg.security_group_id]
+}
+
 # Only use the import statement, if you want to import an existing loadbalancer
 import {
   to = stackit_loadbalancer.import-example
   id = "${var.project_id},${var.region},${var.loadbalancer_name}"
-}
+}
\ No newline at end of file
diff --git a/stackit/internal/services/loadbalancer/loadbalancer/datasource.go b/stackit/internal/services/loadbalancer/loadbalancer/datasource.go
index d7f3a2157..c72306656 100644
--- a/stackit/internal/services/loadbalancer/loadbalancer/datasource.go
+++ b/stackit/internal/services/loadbalancer/loadbalancer/datasource.go
@@ -69,6 +69,8 @@ func (r *loadBalancerDataSource) Schema(_ context.Context, _ datasource.SchemaRe
 		"id":                                    "Terraform's internal resource ID. It is structured as \"`project_id`\",\"region\",\"`name`\".",
 		"project_id":                            "STACKIT project ID to which the Load Balancer is associated.",
 		"external_address":                      "External Load Balancer IP address where this Load Balancer is exposed.",
+		"disable_security_group_assignment":     "If set to true, this will disable the automatic assignment of a security group to the load balancer's targets. This option is primarily used to allow targets that are not within the load balancer's own network or SNA. When this is enabled, you are fully responsible for ensuring network connectivity to the targets, including managing all routing and security group rules manually. This setting cannot be changed after the load balancer is created.",
+		"security_group_id":                     "The ID of the egress security group assigned to the Load Balancer's internal machines. This ID is essential for allowing traffic from the Load Balancer to targets in different networks or STACKIT NETWORK AREAS (SNA). To enable this, create a security group rule for your target VMs and set the `remote_security_group_id` of that rule to this value. This is typically used when `disable_security_group_assignment` is set to `true`.",
 		"listeners":                             "List of all listeners which will accept traffic. Limited to 20.",
 		"port":                                  "Port number where we listen for traffic.",
 		"protocol":                              "Protocol is the highest network protocol we understand to load balance.",
@@ -125,6 +127,10 @@ func (r *loadBalancerDataSource) Schema(_ context.Context, _ datasource.SchemaRe
 				Description: descriptions["external_address"],
 				Computed:    true,
 			},
+			"disable_security_group_assignment": schema.BoolAttribute{
+				Description: descriptions["disable_security_group_assignment"],
+				Computed:    true,
+			},
 			"plan_id": schema.StringAttribute{
 				Description: descriptions["plan_id"],
 				Computed:    true,
@@ -339,6 +345,10 @@ func (r *loadBalancerDataSource) Schema(_ context.Context, _ datasource.SchemaRe
 				Optional:    true,
 				Description: descriptions["region"],
 			},
+			"security_group_id": schema.StringAttribute{
+				Description: descriptions["security_group_id"],
+				Computed:    true,
+			},
 		},
 	}
 }
diff --git a/stackit/internal/services/loadbalancer/loadbalancer/resource.go b/stackit/internal/services/loadbalancer/loadbalancer/resource.go
index 36e0e1f74..61a2ad6c1 100644
--- a/stackit/internal/services/loadbalancer/loadbalancer/resource.go
+++ b/stackit/internal/services/loadbalancer/loadbalancer/resource.go
@@ -18,6 +18,7 @@ import (
 	"github.com/hashicorp/terraform-plugin-framework/path"
 	"github.com/hashicorp/terraform-plugin-framework/resource"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema"
+	"github.com/hashicorp/terraform-plugin-framework/resource/schema/booldefault"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/boolplanmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/int64planmodifier"
 	"github.com/hashicorp/terraform-plugin-framework/resource/schema/listplanmodifier"
@@ -48,17 +49,19 @@ var (
 )
 
 type Model struct {
-	Id              types.String `tfsdk:"id"` // needed by TF
-	ProjectId       types.String `tfsdk:"project_id"`
-	ExternalAddress types.String `tfsdk:"external_address"`
-	Listeners       types.List   `tfsdk:"listeners"`
-	Name            types.String `tfsdk:"name"`
-	PlanId          types.String `tfsdk:"plan_id"`
-	Networks        types.List   `tfsdk:"networks"`
-	Options         types.Object `tfsdk:"options"`
-	PrivateAddress  types.String `tfsdk:"private_address"`
-	TargetPools     types.List   `tfsdk:"target_pools"`
-	Region          types.String `tfsdk:"region"`
+	Id                             types.String `tfsdk:"id"` // needed by TF
+	ProjectId                      types.String `tfsdk:"project_id"`
+	ExternalAddress                types.String `tfsdk:"external_address"`
+	DisableSecurityGroupAssignment types.Bool   `tfsdk:"disable_security_group_assignment"`
+	Listeners                      types.List   `tfsdk:"listeners"`
+	Name                           types.String `tfsdk:"name"`
+	PlanId                         types.String `tfsdk:"plan_id"`
+	Networks                       types.List   `tfsdk:"networks"`
+	Options                        types.Object `tfsdk:"options"`
+	PrivateAddress                 types.String `tfsdk:"private_address"`
+	TargetPools                    types.List   `tfsdk:"target_pools"`
+	Region                         types.String `tfsdk:"region"`
+	SecurityGroupId                types.String `tfsdk:"security_group_id"`
 }
 
 // Struct corresponding to Model.Listeners[i]
@@ -303,6 +306,7 @@ func (r *loadBalancerResource) Schema(_ context.Context, _ resource.SchemaReques
 		"id":                                    "Terraform's internal resource ID. It is structured as \"`project_id`\",\"region\",\"`name`\".",
 		"project_id":                            "STACKIT project ID to which the Load Balancer is associated.",
 		"external_address":                      "External Load Balancer IP address where this Load Balancer is exposed.",
+		"disable_security_group_assignment":     "If set to true, this will disable the automatic assignment of a security group to the load balancer's targets. This option is primarily used to allow targets that are not within the load balancer's own network or SNA. When this is enabled, you are fully responsible for ensuring network connectivity to the targets, including managing all routing and security group rules manually. This setting cannot be changed after the load balancer is created.",
 		"listeners":                             "List of all listeners which will accept traffic. Limited to 20.",
 		"port":                                  "Port number where we listen for traffic.",
 		"protocol":                              "Protocol is the highest network protocol we understand to load balance. " + utils.SupportedValuesDocumentation(protocolOptions),
@@ -339,6 +343,7 @@ func (r *loadBalancerResource) Schema(_ context.Context, _ resource.SchemaReques
 		"targets.display_name":                  "Target display name",
 		"ip":                                    "Target IP",
 		"region":                                "The resource region. If not defined, the provider region is used.",
+		"security_group_id":                     "The ID of the egress security group assigned to the Load Balancer's internal machines. This ID is essential for allowing traffic from the Load Balancer to targets in different networks or STACKIT NETWORK AREAS (SNA). To enable this, create a security group rule for your target VMs and set the `remote_security_group_id` of that rule to this value. This is typically used when `disable_security_group_assignment` is set to `true`.",
 	}
 
 	resp.Schema = schema.Schema{
@@ -373,6 +378,16 @@ The example below creates the supporting infrastructure using the STACKIT Terraf
 					stringplanmodifier.RequiresReplace(),
 				},
 			},
+			"disable_security_group_assignment": schema.BoolAttribute{
+				Description: descriptions["disable_security_group_assignment"],
+				Optional:    true,
+				Computed:    true,
+				Default:     booldefault.StaticBool(false),
+				PlanModifiers: []planmodifier.Bool{
+					boolplanmodifier.RequiresReplace(),
+					boolplanmodifier.UseStateForUnknown(),
+				},
+			},
 			"plan_id": schema.StringAttribute{
 				Description: descriptions["plan_id"],
 				Optional:    true,
@@ -669,6 +684,13 @@ The example below creates the supporting infrastructure using the STACKIT Terraf
 					stringplanmodifier.RequiresReplace(),
 				},
 			},
+			"security_group_id": schema.StringAttribute{
+				Description: descriptions["security_group_id"],
+				Computed:    true,
+				PlanModifiers: []planmodifier.String{
+					stringplanmodifier.UseStateForUnknown(),
+				},
+			},
 		},
 	}
 }
@@ -907,13 +929,14 @@ func toCreatePayload(ctx context.Context, model *Model) (*loadbalancer.CreateLoa
 	}
 
 	return &loadbalancer.CreateLoadBalancerPayload{
-		ExternalAddress: conversion.StringValueToPointer(model.ExternalAddress),
-		Listeners:       listenersPayload,
-		Name:            conversion.StringValueToPointer(model.Name),
-		PlanId:          conversion.StringValueToPointer(model.PlanId),
-		Networks:        networksPayload,
-		Options:         optionsPayload,
-		TargetPools:     targetPoolsPayload,
+		ExternalAddress:                      conversion.StringValueToPointer(model.ExternalAddress),
+		DisableTargetSecurityGroupAssignment: conversion.BoolValueToPointer(model.DisableSecurityGroupAssignment),
+		Listeners:                            listenersPayload,
+		Name:                                 conversion.StringValueToPointer(model.Name),
+		PlanId:                               conversion.StringValueToPointer(model.PlanId),
+		Networks:                             networksPayload,
+		Options:                              optionsPayload,
+		TargetPools:                          targetPoolsPayload,
 	}, nil
 }
 
@@ -1221,7 +1244,13 @@ func mapFields(ctx context.Context, lb *loadbalancer.LoadBalancer, m *Model, reg
 	m.PlanId = types.StringPointerValue(lb.PlanId)
 	m.ExternalAddress = types.StringPointerValue(lb.ExternalAddress)
 	m.PrivateAddress = types.StringPointerValue(lb.PrivateAddress)
+	m.DisableSecurityGroupAssignment = types.BoolPointerValue(lb.DisableTargetSecurityGroupAssignment)
 
+	if lb.TargetSecurityGroup != nil {
+		m.SecurityGroupId = types.StringPointerValue(lb.TargetSecurityGroup.Id)
+	} else {
+		m.SecurityGroupId = types.StringNull()
+	}
 	err := mapListeners(lb, m)
 	if err != nil {
 		return fmt.Errorf("mapping listeners: %w", err)
diff --git a/stackit/internal/services/loadbalancer/loadbalancer/resource_test.go b/stackit/internal/services/loadbalancer/loadbalancer/resource_test.go
index 2a1a85b79..810e9c395 100644
--- a/stackit/internal/services/loadbalancer/loadbalancer/resource_test.go
+++ b/stackit/internal/services/loadbalancer/loadbalancer/resource_test.go
@@ -489,9 +489,10 @@ func TestMapFields(t *testing.T) {
 						}),
 					}),
 				}),
-				PrivateAddress: types.StringNull(),
-				TargetPools:    types.ListNull(types.ObjectType{AttrTypes: targetPoolTypes}),
-				Region:         types.StringValue(testRegion),
+				PrivateAddress:  types.StringNull(),
+				SecurityGroupId: types.StringNull(),
+				TargetPools:     types.ListNull(types.ObjectType{AttrTypes: targetPoolTypes}),
+				Region:          types.StringValue(testRegion),
 			},
 			true,
 		},
@@ -536,6 +537,10 @@ func TestMapFields(t *testing.T) {
 						},
 					},
 				}),
+				TargetSecurityGroup: loadbalancer.LoadBalancerGetTargetSecurityGroupAttributeType(&loadbalancer.SecurityGroup{
+					Id:   utils.Ptr("sg-id-12345"),
+					Name: utils.Ptr("sg-name-abcde"),
+				}),
 				TargetPools: utils.Ptr([]loadbalancer.TargetPool{
 					{
 						ActiveHealthCheck: utils.Ptr(loadbalancer.ActiveHealthCheck{
@@ -565,6 +570,7 @@ func TestMapFields(t *testing.T) {
 				Id:              types.StringValue(id),
 				ProjectId:       types.StringValue("pid"),
 				ExternalAddress: types.StringValue("external_address"),
+				SecurityGroupId: types.StringValue("sg-id-12345"),
 				Listeners: types.ListValueMust(types.ObjectType{AttrTypes: listenerTypes}, []attr.Value{
 					types.ObjectValueMust(listenerTypes, map[string]attr.Value{
 						"display_name": types.StringValue("display_name"),
diff --git a/stackit/internal/services/loadbalancer/loadbalancer_acc_test.go b/stackit/internal/services/loadbalancer/loadbalancer_acc_test.go
index 2d3c974b9..34693a7c5 100644
--- a/stackit/internal/services/loadbalancer/loadbalancer_acc_test.go
+++ b/stackit/internal/services/loadbalancer/loadbalancer_acc_test.go
@@ -47,17 +47,18 @@ var testConfigVarsMin = config.Variables{
 }
 
 var testConfigVarsMax = config.Variables{
-	"project_id":          config.StringVariable(testutil.ProjectId),
-	"plan_id":             config.StringVariable("p10"),
-	"network_name":        config.StringVariable(fmt.Sprintf("tf-acc-n%s", acctest.RandStringFromCharSet(7, acctest.CharSetAlphaNum))),
-	"server_name":         config.StringVariable(fmt.Sprintf("tf-acc-s%s", acctest.RandStringFromCharSet(7, acctest.CharSetAlphaNum))),
-	"loadbalancer_name":   config.StringVariable(fmt.Sprintf("tf-acc-l%s", acctest.RandStringFromCharSet(7, acctest.CharSetAlphaNum))),
-	"target_pool_name":    config.StringVariable("example-target-pool"),
-	"target_port":         config.StringVariable("5432"),
-	"target_display_name": config.StringVariable("example-target"),
-	"listener_port":       config.StringVariable("5432"),
-	"listener_protocol":   config.StringVariable("PROTOCOL_TLS_PASSTHROUGH"),
-	"network_role":        config.StringVariable("ROLE_LISTENERS_AND_TARGETS"),
+	"project_id":                        config.StringVariable(testutil.ProjectId),
+	"plan_id":                           config.StringVariable("p10"),
+	"disable_security_group_assignment": config.BoolVariable(true),
+	"network_name":                      config.StringVariable(fmt.Sprintf("tf-acc-n%s", acctest.RandStringFromCharSet(7, acctest.CharSetAlphaNum))),
+	"server_name":                       config.StringVariable(fmt.Sprintf("tf-acc-s%s", acctest.RandStringFromCharSet(7, acctest.CharSetAlphaNum))),
+	"loadbalancer_name":                 config.StringVariable(fmt.Sprintf("tf-acc-l%s", acctest.RandStringFromCharSet(7, acctest.CharSetAlphaNum))),
+	"target_pool_name":                  config.StringVariable("example-target-pool"),
+	"target_port":                       config.StringVariable("5432"),
+	"target_display_name":               config.StringVariable("example-target"),
+	"listener_port":                     config.StringVariable("5432"),
+	"listener_protocol":                 config.StringVariable("PROTOCOL_TLS_PASSTHROUGH"),
+	"network_role":                      config.StringVariable("ROLE_LISTENERS_AND_TARGETS"),
 
 	"listener_display_name":           config.StringVariable("example-listener"),
 	"listener_server_name_indicators": config.StringVariable("acc-test.runs.onstackit.cloud"),
@@ -118,10 +119,12 @@ func TestAccLoadBalancerResourceMin(t *testing.T) {
 					resource.TestCheckResourceAttrSet("stackit_loadbalancer.loadbalancer", "networks.0.network_id"),
 					resource.TestCheckResourceAttr("stackit_loadbalancer.loadbalancer", "networks.0.role", testutil.ConvertConfigVariable(testConfigVarsMin["network_role"])),
 					resource.TestCheckResourceAttrSet("stackit_loadbalancer.loadbalancer", "external_address"),
+					resource.TestCheckResourceAttr("stackit_loadbalancer.loadbalancer", "disable_security_group_assignment", "false"),
 					resource.TestCheckNoResourceAttr("stackit_loadbalancer.loadbalancer", "options.observability.logs.credentials_ref"),
 					resource.TestCheckNoResourceAttr("stackit_loadbalancer.loadbalancer", "options.observability.logs.push_url"),
 					resource.TestCheckNoResourceAttr("stackit_loadbalancer.loadbalancer", "options.observability.metrics.credentials_ref"),
 					resource.TestCheckNoResourceAttr("stackit_loadbalancer.loadbalancer", "options.observability.metrics.push_url"),
+					resource.TestCheckResourceAttrSet("stackit_loadbalancer.loadbalancer", "security_group_id"),
 
 					// Loadbalancer observability credentials resource
 					resource.TestCheckResourceAttr("stackit_loadbalancer_observability_credential.obs_credential", "project_id", testutil.ConvertConfigVariable(testConfigVarsMin["project_id"])),
@@ -168,10 +171,12 @@ func TestAccLoadBalancerResourceMin(t *testing.T) {
 					resource.TestCheckResourceAttrSet("data.stackit_loadbalancer.loadbalancer", "networks.0.network_id"),
 					resource.TestCheckResourceAttr("data.stackit_loadbalancer.loadbalancer", "networks.0.role", testutil.ConvertConfigVariable(testConfigVarsMin["network_role"])),
 					resource.TestCheckResourceAttrSet("data.stackit_loadbalancer.loadbalancer", "external_address"),
+					resource.TestCheckResourceAttr("data.stackit_loadbalancer.loadbalancer", "disable_security_group_assignment", "false"),
 					resource.TestCheckNoResourceAttr("data.stackit_loadbalancer.loadbalancer", "options.observability.logs.credentials_ref"),
 					resource.TestCheckNoResourceAttr("data.stackit_loadbalancer.loadbalancer", "options.observability.logs.push_url"),
 					resource.TestCheckNoResourceAttr("data.stackit_loadbalancer.loadbalancer", "options.observability.metrics.credentials_ref"),
 					resource.TestCheckNoResourceAttr("data.stackit_loadbalancer.loadbalancer", "options.observability.metrics.push_url"),
+					resource.TestCheckResourceAttrSet("data.stackit_loadbalancer.loadbalancer", "security_group_id"),
 				)},
 			// Import
 			{
@@ -234,6 +239,8 @@ func TestAccLoadBalancerResourceMax(t *testing.T) {
 					resource.TestCheckResourceAttrSet("stackit_loadbalancer.loadbalancer", "networks.0.network_id"),
 					resource.TestCheckResourceAttr("stackit_loadbalancer.loadbalancer", "networks.0.role", testutil.ConvertConfigVariable(testConfigVarsMax["network_role"])),
 					resource.TestCheckResourceAttrSet("stackit_loadbalancer.loadbalancer", "external_address"),
+					resource.TestCheckResourceAttr("stackit_loadbalancer.loadbalancer", "disable_security_group_assignment", testutil.ConvertConfigVariable(testConfigVarsMax["disable_security_group_assignment"])),
+					resource.TestCheckResourceAttrSet("stackit_loadbalancer.loadbalancer", "security_group_id"),
 
 					resource.TestCheckResourceAttr("stackit_loadbalancer.loadbalancer", "target_pools.0.active_health_check.healthy_threshold", testutil.ConvertConfigVariable(testConfigVarsMax["healthy_threshold"])),
 					resource.TestCheckResourceAttr("stackit_loadbalancer.loadbalancer", "target_pools.0.active_health_check.interval", testutil.ConvertConfigVariable(testConfigVarsMax["health_interval"])),
@@ -304,6 +311,8 @@ func TestAccLoadBalancerResourceMax(t *testing.T) {
 					resource.TestCheckResourceAttrSet("data.stackit_loadbalancer.loadbalancer", "networks.0.network_id"),
 					resource.TestCheckResourceAttr("data.stackit_loadbalancer.loadbalancer", "networks.0.role", testutil.ConvertConfigVariable(testConfigVarsMax["network_role"])),
 					resource.TestCheckResourceAttrSet("data.stackit_loadbalancer.loadbalancer", "external_address"),
+					resource.TestCheckResourceAttr("data.stackit_loadbalancer.loadbalancer", "disable_security_group_assignment", testutil.ConvertConfigVariable(testConfigVarsMax["disable_security_group_assignment"])),
+					resource.TestCheckResourceAttrSet("data.stackit_loadbalancer.loadbalancer", "security_group_id"),
 
 					resource.TestCheckResourceAttr("data.stackit_loadbalancer.loadbalancer", "target_pools.0.active_health_check.healthy_threshold", testutil.ConvertConfigVariable(testConfigVarsMax["healthy_threshold"])),
 					resource.TestCheckResourceAttr("data.stackit_loadbalancer.loadbalancer", "target_pools.0.active_health_check.interval", testutil.ConvertConfigVariable(testConfigVarsMax["health_interval"])),
diff --git a/stackit/internal/services/loadbalancer/testfiles/resource-max.tf b/stackit/internal/services/loadbalancer/testfiles/resource-max.tf
index aabd752d5..491a64803 100644
--- a/stackit/internal/services/loadbalancer/testfiles/resource-max.tf
+++ b/stackit/internal/services/loadbalancer/testfiles/resource-max.tf
@@ -11,6 +11,7 @@ variable "target_display_name" {}
 variable "listener_port" {}
 variable "listener_protocol" {}
 variable "network_role" {}
+variable "disable_security_group_assignment" {}
 
 variable "listener_display_name" {}
 variable "listener_server_name_indicators" {}
@@ -72,9 +73,10 @@ resource "stackit_server" "server" {
 }
 
 resource "stackit_loadbalancer" "loadbalancer" {
-  project_id = var.project_id
-  name       = var.loadbalancer_name
-  plan_id    = var.plan_id
+  project_id                        = var.project_id
+  name                              = var.loadbalancer_name
+  plan_id                           = var.plan_id
+  disable_security_group_assignment = var.disable_security_group_assignment
   target_pools = [
     {
       name        = var.target_pool_name
@@ -120,14 +122,14 @@ resource "stackit_loadbalancer" "loadbalancer" {
     private_network_only = var.private_network_only
     acl                  = [var.acl]
     observability = {
-    	logs = {
-    		credentials_ref = stackit_loadbalancer_observability_credential.logs.credentials_ref
-    		push_url = var.observability_logs_push_url
-    	}
-    	metrics = {
-    		credentials_ref = stackit_loadbalancer_observability_credential.metrics.credentials_ref
-    		push_url = var.observability_metrics_push_url
-    	}
+      logs = {
+        credentials_ref = stackit_loadbalancer_observability_credential.logs.credentials_ref
+        push_url        = var.observability_logs_push_url
+      }
+      metrics = {
+        credentials_ref = stackit_loadbalancer_observability_credential.metrics.credentials_ref
+        push_url        = var.observability_metrics_push_url
+      }
     }
   }
   external_address = stackit_public_ip.public_ip.ip
diff --git a/stackit/internal/services/loadbalancer/testfiles/resource-min.tf b/stackit/internal/services/loadbalancer/testfiles/resource-min.tf
index 2b6d65793..f2692c35d 100644
--- a/stackit/internal/services/loadbalancer/testfiles/resource-min.tf
+++ b/stackit/internal/services/loadbalancer/testfiles/resource-min.tf
@@ -27,6 +27,11 @@ resource "stackit_network_interface" "network_interface" {
   project_id = stackit_network.network.project_id
   network_id = stackit_network.network.network_id
   name       = "name"
+  lifecycle {
+    ignore_changes = [
+      security_group_ids,
+    ]
+  }
 }
 
 resource "stackit_public_ip" "public_ip" {