It is not possible to log in to Plesk as a Plesk administrator with the following message:
PLESK_ERROR: Access for administrator from address 203.0.113.2 is restricted in accordance with IP Access restriction policy currently applied.
The current Plesk IP access policy does not allow to log in from a particular IP address.
This setting is configured in Plesk at Tools & Settings > Restrict Administrative Access.
Apply one of the following solutions: