optimize:optimize the exception message

changes/en-us/2.x.md

@@ -19,7 +19,7 @@ Add changes here for all PR submitted to the 2.x branch.
 <!-- Please add the `changes` to the following location(feature/bugfix/optimize/test) based on the type of PR -->
 
 ### feature:
-
+- [[#7599](https://github.com/apache/incubator-seata/pull/7485)] Optimize the exception message
 - [[#7485](https://github.com/apache/incubator-seata/pull/7485)] Add http request filter for seata-server
 - [[#7509](https://github.com/apache/incubator-seata/pull/7509)] Reuse connection to merge branch transactions
 - [[#7492](https://github.com/apache/incubator-seata/pull/7492)] upgrade HTTP client in common module to support HTTP/2

changes/zh-cn/2.x.md

@@ -20,6 +20,7 @@
 
 ### feature:
 
+- [[#7599](https://github.com/apache/incubator-seata/pull/7485)] 优化异常消息
 - [[#7485](https://github.com/apache/incubator-seata/pull/7485)] 给seata-server端的http请求添加过滤器
 - [[#7509](https://github.com/apache/incubator-seata/pull/7509)] 复用连接合并分支事务
 - [[#7492](https://github.com/apache/incubator-seata/pull/7492)] 升级 common 模块中的 HTTP 客户端以支持 HTTP/2

core/src/main/java/org/apache/seata/core/rpc/netty/NettyClientBootstrap.java

@@ -180,9 +180,11 @@ public Channel getNewChannel(InetSocketAddress address) {
         try {
             f.await(this.nettyClientConfig.getConnectTimeoutMillis(), TimeUnit.MILLISECONDS);
             if (f.isCancelled()) {
-                throw new FrameworkException(f.cause(), "connect cancelled, can not connect to services-server.");
+                throw new FrameworkException(
+                        f.cause(), "connect cancelled, can not connect to services-server:" + address.toString() + ".");
             } else if (!f.isSuccess()) {
-                throw new FrameworkException(f.cause(), "connect failed, can not connect to services-server.");
+                throw new FrameworkException(
+                        f.cause(), "connect failed, can not connect to services-server:" + address.toString() + ".");
             } else {
                 channel = f.channel();
             }
@@ -208,8 +210,10 @@ public void handlerAdded(ChannelHandlerContext ctx) {
                 channel = bootstrap.open().get();
             }
 
+        } catch (FrameworkException frameworkException) {
+            throw frameworkException;
         } catch (Exception e) {
-            throw new FrameworkException(e, "can not connect to services-server.");
+            throw new FrameworkException(e, "can not connect to services-server:" + address.toString() + ".");
         }
 
         return channel;