- Plesk for Windows
- Websites which use MSSQL databases are unavailable with error in browser:
CONFIG_TEXT: A network-related or instance-specific error has occurred while establishing a connection to SQL Server. Server is not found or not accessible. Check if instance name is correct and if SQL Server is configured to allow remote connections. For more information see SQL Server Books Online. Login timeout expired
- Bunch of errors like below are observed in Event Viewer > Windows Logs > Application :
CONFIG_TEXT: Length specified in network packet payload did not match number of bytes read; the connection has been closed. Please contact the vendor of the client library. [CLIENT: 203.0.113.2]
MSSQL server is under DDoS attack.
Configure a firewall rules for 1433 MSSQL port, so that it will be accessible only from local network and for remote administrators.
In order to configure server firewall through Plesk Firewall, refer to the documentation: The Plesk Firewall (Windows)