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

Symptoms

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

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

2. On the target server there is the following error is shown in
   %plesk_dir%var\modules\panel-migrator\sessions\<SESSION_TIME_STAMP>\debug.log:

   CONFIG_TEXT: core.utils.common.http_xml_client|||API request to https://203.0.113.2:8443/enterprise/control/agent.php:
   ...
   core.connections.checker|||URLError: <urlopen error [Errno 10049] The requested address is not valid in its context>

3. IP address 203.0.113.2 does not exist on the target server:

   C:\> C:> ipconfig | findstr 203.0.113.2
   C:>

4. IP address 203.0.113.2 exists in Tools & Settings > IP addresses.

Cause

Incorrect IP address selected fro migration.

Resolution

1. Connect to the server via RDP.

2. Open %plesk_dir%var\modules\panel-migrator\sessions\<SESSION_TIME_STAMP\config

3. Change IP address under [plesk] section:

   CONFIG_TEXT: [plesk]
   ip = "203.0.113.3"