diff --git a/core/src/main/java/org/apache/seata/core/rpc/RemotingServer.java b/core/src/main/java/org/apache/seata/core/rpc/RemotingServer.java
index c3141603a07..f38e301b852 100644
--- a/core/src/main/java/org/apache/seata/core/rpc/RemotingServer.java
+++ b/core/src/main/java/org/apache/seata/core/rpc/RemotingServer.java
@@ -21,6 +21,7 @@
 import org.apache.seata.core.rpc.processor.RemotingProcessor;
 import org.apache.seata.core.protocol.MessageType;
 
+import java.io.IOException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.TimeoutException;
 
@@ -41,7 +42,7 @@ public interface RemotingServer {
      * @return client result message
      * @throws TimeoutException TimeoutException
      */
-    Object sendSyncRequest(String resourceId, String clientId, Object msg, boolean tryOtherApp) throws TimeoutException;
+    Object sendSyncRequest(String resourceId, String clientId, Object msg, boolean tryOtherApp) throws TimeoutException, IOException;
 
     /**
      * server send sync request.
@@ -51,7 +52,7 @@ public interface RemotingServer {
      * @return client result message
      * @throws TimeoutException TimeoutException
      */
-    Object sendSyncRequest(Channel channel, Object msg) throws TimeoutException;
+    Object sendSyncRequest(Channel channel, Object msg) throws TimeoutException, IOException;
 
     /**
      * server send async request.
@@ -59,7 +60,7 @@ public interface RemotingServer {
      * @param channel client channel
      * @param msg     transaction message {@code org.apache.seata.core.protocol}
      */
-    void sendAsyncRequest(Channel channel, Object msg);
+    void sendAsyncRequest(Channel channel, Object msg) throws IOException;
 
     /**
      * server send async response.
diff --git a/core/src/main/java/org/apache/seata/core/rpc/netty/AbstractNettyRemotingServer.java b/core/src/main/java/org/apache/seata/core/rpc/netty/AbstractNettyRemotingServer.java
index 67df2ea8494..fc6a7f21dd3 100644
--- a/core/src/main/java/org/apache/seata/core/rpc/netty/AbstractNettyRemotingServer.java
+++ b/core/src/main/java/org/apache/seata/core/rpc/netty/AbstractNettyRemotingServer.java
@@ -16,6 +16,7 @@
  */
 package org.apache.seata.core.rpc.netty;
 
+import java.io.IOException;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeoutException;
@@ -68,28 +69,28 @@ public AbstractNettyRemotingServer(ThreadPoolExecutor messageExecutor, NettyServ
 
     @Override
     public Object sendSyncRequest(String resourceId, String clientId, Object msg, boolean tryOtherApp)
-        throws TimeoutException {
+            throws TimeoutException, IOException {
         Channel channel = ChannelManager.getChannel(resourceId, clientId, tryOtherApp);
         if (channel == null) {
-            throw new RuntimeException("rm client is not connected. dbkey:" + resourceId + ",clientId:" + clientId);
+            throw new IOException("rm client is not connected. dbkey:" + resourceId + ",clientId:" + clientId);
         }
         RpcMessage rpcMessage = buildRequestMessage(msg, ProtocolConstants.MSGTYPE_RESQUEST_SYNC);
         return super.sendSync(channel, rpcMessage, NettyServerConfig.getRpcRequestTimeout());
     }
 
     @Override
-    public Object sendSyncRequest(Channel channel, Object msg) throws TimeoutException {
+    public Object sendSyncRequest(Channel channel, Object msg) throws TimeoutException, IOException {
         if (channel == null) {
-            throw new RuntimeException("client is not connected");
+            throw new IOException("client is not connected");
         }
         RpcMessage rpcMessage = buildRequestMessage(msg, ProtocolConstants.MSGTYPE_RESQUEST_SYNC);
         return super.sendSync(channel, rpcMessage, NettyServerConfig.getRpcRequestTimeout());
     }
 
     @Override
-    public void sendAsyncRequest(Channel channel, Object msg) {
+    public void sendAsyncRequest(Channel channel, Object msg) throws IOException {
         if (channel == null) {
-            throw new RuntimeException("client is not connected");
+            throw new IOException("client is not connected");
         }
         RpcMessage rpcMessage = buildRequestMessage(msg, ProtocolConstants.MSGTYPE_RESQUEST_ONEWAY);
         super.sendAsync(channel, rpcMessage);
diff --git a/mock-server/src/main/java/org/apache/seata/mockserver/call/CallRm.java b/mock-server/src/main/java/org/apache/seata/mockserver/call/CallRm.java
index 8a347246f33..be48ab4c63b 100644
--- a/mock-server/src/main/java/org/apache/seata/mockserver/call/CallRm.java
+++ b/mock-server/src/main/java/org/apache/seata/mockserver/call/CallRm.java
@@ -16,6 +16,7 @@
  */
 package org.apache.seata.mockserver.call;
 
+import java.io.IOException;
 import java.util.concurrent.TimeoutException;
 
 import io.netty.channel.Channel;
@@ -49,7 +50,7 @@ public static BranchStatus branchCommit(RemotingServer remotingServer, MockBranc
             BranchCommitResponse response = (BranchCommitResponse)remotingServer.sendSyncRequest(
                 branchSession.getResourceId(), branchSession.getClientId(), request, false);
             return response.getBranchStatus();
-        } catch (TimeoutException e) {
+        } catch (TimeoutException | IOException e) {
             throw new RuntimeException(e);
         }
     }
@@ -68,7 +69,7 @@ public static BranchStatus branchRollback(RemotingServer remotingServer, MockBra
             BranchRollbackResponse response = (BranchRollbackResponse)remotingServer.sendSyncRequest(
                 branchSession.getResourceId(), branchSession.getClientId(), request, false);
             return response.getBranchStatus();
-        } catch (TimeoutException e) {
+        } catch (TimeoutException | IOException e) {
             throw new RuntimeException(e);
         }
     }