Symptoms
Customer is not able to login to Plesk of his PVPS installation via CCP. The following error message is displayed:
"Unable to complete the operation, please try again later."
However, in browser console one might notice that request createAdminSession finishes with HTTP 500 error and the following error message from PVPS endpoint:
"Internal Server Error: Access for administrator from address 'xx.xx.xx.xx' is restricted in accordance with IP Access restriction policy currently applied."
Cause
User restricted access to Plesk control panel in Plesk settings.
Resolution
Apply instructions from the following Plesk KB article or recreate VE via OA CCP.