Error message Customer.Client.Network.SyncInterrupted during server migration-Server Migration Center(SMC)-阿里云帮助中心

When an SMC migration task fails with the error "Customer.Client.Network.SyncInterrupted", the network connection between the source system and the destination instance was interrupted. This topic explains the cause and how to resolve the issue.

Problem description

During SMC migration, the migration task fails with the error message "Customer.Client.Network.SyncInterrupted".

Cause

The network connection from the source system to the destination instance on port IP:8703 is interrupted.

Solution

Ensure that the network connection from the source system to the destination instance on port IP:8703 is stable, and do not interrupt the network during migration. After the connection is restored, retry the migration task.

Note

You can use iperf to test the network transmission stability between the source system and the destination instance. For more information, see Evaluate migration time and test transmission speed.

Linux transmission stability test example

The following example uses CentOS 7. Replace the OS version with the one used in your environment.

Create a pay-as-you-go CentOS 7 instance in the destination region of Alibaba Cloud.
Add an inbound rule to the security group of the instance to allow the port required by iperf.

In this example, the default TCP port 5001 for iperf is used.
Connect to the CentOS 7 instance remotely.
On the CentOS 7 instance, perform the following operations:
1. Run the following command to install the iperf tool.
```
yum -y install iperf3
```
2. Run the following command to start iperf as a server.
```
iperf3 -s
```
On the source server system, perform the following operations:
1. Download and install the iperf tool.
2. Run the following command to start iperf as a client.
  Replace <instance IP> in the command with the public IP address of the created instance. The value 1200 indicates that the test duration is 1200 seconds.
```
iperf3 -c <instance IP> -i 1 -t 1200 -d
```
Wait for and record the iperf test results.

Windows transmission stability example

The following example uses Windows Server 2008. Replace the OS version with the one used in your environment.

Create a pay-as-you-go Windows Server 2008 instance in the destination region of Alibaba Cloud.
Add an inbound rule to the security group of the instance to allow the port required by iperf.

In this example, the default TCP port 5001 for iperf is used.
Connect to the instance remotely.
On the Windows Server 2008 instance, perform the following operations:
1. Download and install the iperf tool.
2. Open a cmd window.
3. Run the cd <iperf directory> command to navigate to the tool directory.
4. Run the iperf3.exe -s command to start iperf as a server.
On the source server system, perform the following operations:
1. Download and install the iperf tool.
2. Run the following command to start iperf as a client.
  
  Replace <instance IP> in the command with the public IP address of the created instance. The value 1200 indicates that the test duration is 1200 seconds.
```
iperf3 -c <instance IP> -i 1 -t 1200 -d
```
Wait for and record the iperf test results.