Unable to start migration in Plesk: urlopen error [Errno 10049] The requested address is not valid in its context

Symptoms

• Migration in Plesk fails with the following error in Tools & Settings > Migrator & Transfer Manager > source server:

  Failed to connect to target Plesk server by Plesk API: <urlopen error [Errno 10049] The requested address is not valid in its context>

• IP address 203.0.113.2 does not exist on the target server:

  C:> ipconfig | findstr 203.0.113.2
  C:>

  But exists in Tools & Settings > IP addresses

Cause

The incorrect IP address selected from migration.

Resolution

1. Connect to the server via RDP

2. Open the %plesk_dir%varmodulespanel-migratorsessions<SESSION_TIME_STAMPconfig file

3. Manually change IP address under the [plesk] section:

   [plesk]
   ip = "203.0.113.3"