The following error message appears in the Plesk interface or during Plesk migration process:
PLESK_INFO: Unable to connect to database: Too many connections
SQLSTATE  Too many connections
Websites fail to load with the error:
PLESK_INFO: Error Establishing a Database Connection
Plesk license installation fails with the error:
PLESK_ERROR: Incorrect ServerInfo format (Error code: 2)
exit status 1
The maximum number of simultaneous connections to the MySQL server has been reached and new connections to the server cannot be established.
For Plesk on Linux
Note: On Linux server with MySQL installed, the
max_connections limit cannot be higher than 214, unless the solution from this KB article is applied.
For Plesk on Windows Server