SMS.0807 Network Error Between Source and Target Servers

Symptom

The migration task failed, and the message "SMS.0807 Network error between source and target servers" was displayed on the console.

Possible Causes

During the full replication phase, the source server establishes a connection with the target and spawns a subprocess to transfer data. If the connection is interrupted, the subprocess automatically attempts to reconnect. If reconnection fails after the maximum number of retries is exceeded, this error message is displayed. Locate and rectify the fault based on the possible causes below.

Unstable Network Connection Between the Source and Target Servers

The network connection is unstable, and the retry times exceed the upper limit. In this case, you can configure automatic recovery and adjust the configuration parameters (such as the maximum number of automatic recovery attempts and the interval) based on your requirements to avoid errors caused by network connection timeout. For details, see How Do I Configure Automatic Recovery?

After the configuration is complete, restart the migration task.

Source and Target Server Disconnected

The network is disconnected during data transfer. You can perform the following operations to locate the fault:

1. Check whether the target server is stopped.
   1. Sign in to the Huawei Cloud ECS console.
   2. In the ECS list, check the status of the target server.
      • If the ECS is stopped, choose More > Start in the Operation column and restart the migration task.
      • If the ECS is running, go to the next step.

2. Check whether the security group, firewall, or ACL rules of the source server are modified during the migration.

   Check whether the connection is disallowed by any security groups, firewalls, or ACL rules on the network between the source and target servers. If it is, modify their settings to allow the source server to access the target server. For details about the network requirements, see How Do I Set Up a Secure Migration Network for Using SMS? Then you can use the following method to check the connectivity:

   Use SSH or Telnet on the source server to check if it can connect to the target server. The commands are in the following format:

   telnet <target-server-IP-address> <port>
   ssh <target-server-IP-address> <port>

   For example, if the target server's IP address is 192.168.0.x and port 22 is used, run either of the following commands:

   telnet 192.168.0.x 22
   ssh 192.168.0.x 22