Symptoms

Unable to start migration:

Failed to connect to target Plesk server by Plesk API: Plesk error [1006]: Access to API is disabled for 203.0.113.2

Cause

8443 TCP port is closed on the target server.

Resolution

Allow connection to 8443 TCP port on the target server:

# iptables -I INPUT 1 -p tcp --dport 8443 -j ACCEPT

Make sure that connection is possible from the target server on 8443 port locally and remotely. For example:

# telnet localhost 8443
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

Additional information

#213916665 Migration to Plesk 12.5 fails: Access to API is disabled