- Plesk for Windows
While accessing any page of Horde webmail except for the inbox messages, the following error is shown:
CONFIG_TEXT: A fatal error has occurred
Could not instantiate PDO. PDOException: SQLSTATE[HY000]  No connection could be made because the target machine actively refused it. Details have been logged for the administrator.
There is no MySQL servers in Tools & Settings > Database Servers.
MySQL database is required for the Horde to work correctly.
Use of the following solutions: