Migration fails: Failed to connect to target Plesk server by Plesk API: urlopen error Errno 10061

Symptoms

• Migration fails with the following error after clicking Prepare migration :

  PLESK_ERROR: Error: Failed to connect to target Plesk server by Plesk API: <urlopen error [Errno 10061] No connection could be made because the target machine actively refused it>

• The following error could be found in "%plesk_dir%"\\var\\modules\\panel-migrator\\sessions\\<timestamp>\\debug.log :

  CONFIG_TEXT: +|D|MT|core.utils.common.http_xml_client|||API request to https://203.0.113.2:8443/enterprise/control/agent.php:
  =|D|MT|core.utils.common.http_xml_client|||<?xml version="1.0" encoding="utf-8"?>
  =|D|MT|core.utils.common.http_xml_client|||<packet version="1.5.2.1">
  =|D|MT|core.utils.common.http_xml_client||| <server>
  =|D|MT|core.utils.common.http_xml_client||| <get>
  =|D|MT|core.utils.common.http_xml_client||| <stat/>
  =|D|MT|core.utils.common.http_xml_client||| </get>
  =|D|MT|core.utils.common.http_xml_client||| </server>
  =|D|MT|core.utils.common.http_xml_client|||</packet>
  =|D|MT|core.utils.common.http_xml_client|||
  +|D|MT|core.connections.checker|||Exception:
  =|D|MT|core.connections.checker|||Traceback (most recent call last):
  ..........
  =|D|MT|core.connections.checker|||URLError: <urlopen error [Errno 10061] No connection could be made because the target machine actively refused it>

• Plesk on a target server is accessible on the custom ports (e.g. 8444 instead of 8443 for HTTPS, and 8881 instead of 8880 for HTTP).

Cause

Migrator tries to connect to a target server via API on port 8443, but Plesk site in IIS works on a different port.

Resolution

Add binding for port 8443 for HTTPS in IIS Manager on a target server:

1. Log into the server via RDP.

2. Go to IIS > Sites > pleskcontrolpanel > Bindings > Add...

3. Specify the following parameters:

   PLESK_INFO: Type: https
   IP address: All Unassigned
   Port: 8443
   SSL certificate: Default Certificate

   and click OK.

4. Restart the pleskcontrolpanel site with Restart button on the right.

Note: the same issue can be actual for Linux also.