How to troubleshoot when Navicat cannot connect to a remote database?

If Navicat is unable to connect to the remote database, you can try the following solutions:

1. Check the network connection: Ensure that there is a stable network connection between the local computer and the remote database server. You can try using the ping command to test if the network connection is working properly.
2. Check the database server settings to ensure that the IP address, port number, username, and password for the remote database server are correct. Pay special attention to whether remote connection permissions are enabled.
3. Firewall configuration: If a firewall is in use, ensure that the IP address and port number of the remote database server are permitted for Navicat access.
4. Check the status of the database server: make sure the remote database server is running and able to accept connection requests. You can try using the telnet command to test the accessibility of the remote database server.
5. Check the Navicat settings: make sure the connection configuration in Navicat is correct. You can try recreating the database connection and ensure that the correct database type is selected and the correct connection information is entered.

If the above methods are still unable to resolve the issue, you can refer to the official documentation of Navicat or contact their official support team for further assistance.