diff --git a/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/util/ReturnCodeResolver.java b/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/util/ReturnCodeResolver.java
index 5c97286a2d..e4b8e8fc2f 100644
--- a/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/util/ReturnCodeResolver.java
+++ b/common/transport/mqtt/src/main/java/org/thingsboard/server/transport/mqtt/util/ReturnCodeResolver.java
@@ -27,7 +27,6 @@ public class ReturnCodeResolver {
         if (!MqttVersion.MQTT_5.equals(mqttVersion) && !ReturnCode.SUCCESS.equals(returnCode)) {
             switch (returnCode) {
                 case BAD_USERNAME_OR_PASSWORD:
-                    return MqttConnectReturnCode.CONNECTION_REFUSED_BAD_USER_NAME_OR_PASSWORD;
                 case NOT_AUTHORIZED_5:
                     return MqttConnectReturnCode.CONNECTION_REFUSED_NOT_AUTHORIZED;
                 case SERVER_UNAVAILABLE_5: