Error:-

Cannot login to Plesk CP, Getting:
"Access for administrator from address xx.xx.xx.xx is restricted in accordance with IP Access restriction policy currently applied."

Cause:-

It means that Plesk IP access policy was configured in such a way that
you cannot login to Plesk from your current IP.

Solution:-

To enable Plesk CP
access you have to login to the server via SSH and change IP access
policy in the 'psa' database. To find current policy and restricted/allowed IPs use the following commands:
# mysql -uadmin -p`cat /etc/psa/.psa.shadow ` psa
mysql> select * from cp_access;
mysql> select * from misc where param='access_policy';
If you wish to clear access policy settings remove all records from "cp_access" and set policy to "allow":
# mysql -uadmin -p`cat /etc/psa/.psa.shadow ` psa
mysql> delete * from cp_access;
mysql> update misc set val="allow" where param='access_policy';
Now you should be able to login to Plesk CP.

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Best Regards,
Jahangir Alam.