diff --git a/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/NewConnectionRespHandler.java b/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/NewConnectionRespHandler.java
index 324a8ca4a..5d6e3ae27 100644
--- a/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/NewConnectionRespHandler.java
+++ b/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/NewConnectionRespHandler.java
@@ -11,6 +11,7 @@ import com.actiontech.dble.net.mysql.RowDataPacket;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.io.IOException;
 import java.util.List;
 import java.util.concurrent.locks.Condition;
 import java.util.concurrent.locks.ReentrantLock;
@@ -21,16 +22,19 @@ public class NewConnectionRespHandler implements ResponseHandler {
     private ReentrantLock lock = new ReentrantLock();
     private Condition initiated = lock.newCondition();
 
-    public BackendConnection getBackConn() {
+    public BackendConnection getBackConn() throws IOException {
         lock.lock();
         try {
-            while (backConn == null) {
+            if (backConn == null) {
                 initiated.await();
             }
+            if (backConn == null) {
+                throw new IOException("get backend connection error ");
+            }
             return backConn;
         } catch (InterruptedException e) {
             LOGGER.warn("getBackConn " + e);
-            return null;
+            throw new IOException(e.getMessage());
         } finally {
             lock.unlock();
         }
@@ -39,7 +43,12 @@ public class NewConnectionRespHandler implements ResponseHandler {
     @Override
     public void connectionError(Throwable e, BackendConnection conn) {
         LOGGER.warn(conn + " connectionError " + e);
-
+        lock.lock();
+        try {
+            initiated.signal();
+        } finally {
+            lock.unlock();
+        }
     }
 
     @Override
diff --git a/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/transaction/xa/XARollbackNodesHandler.java b/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/transaction/xa/XARollbackNodesHandler.java
index 4c95cde46..d7a97c82a 100644
--- a/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/transaction/xa/XARollbackNodesHandler.java
+++ b/src/main/java/com/actiontech/dble/backend/mysql/nio/handler/transaction/xa/XARollbackNodesHandler.java
@@ -341,7 +341,8 @@ public class XARollbackNodesHandler extends AbstractRollbackNodesHandler {
             session.getSource().write(send);
 
             //partitionly commited,must commit again
-        } else if (session.getXaState() == TxState.TX_ROLLBACK_FAILED_STATE || session.getXaState() == TxState.TX_PREPARED_STATE) {
+        } else if (session.getXaState() == TxState.TX_ROLLBACK_FAILED_STATE || session.getXaState() == TxState.TX_PREPARED_STATE ||
+                session.getXaState() == TxState.TX_PREPARE_UNCONNECT_STATE) {
             MySQLConnection errConn = session.releaseExcept(session.getXaState());
             if (errConn != null) {
                 XAStateLog.saveXARecoveryLog(session.getSessionXaID(), session.getXaState());