How to resolve the issue of connecting to FileZilla Server.

1. Check your network connection: first, make sure that your internet connection is working properly by trying to access other websites or services to see if you can connect successfully.
2. Check the firewall settings: Sometimes the firewall may block the connection to FileZilla Server, you can try disabling the firewall or adding an exception rule for FileZilla Server.
3. Check the port settings: FileZilla Server by default uses port 21 for FTP connection, make sure the port settings are correct and not being used by any other program.
4. Check username and password: Make sure the entered username and password are correct, and have permission to connect to FileZilla Server.
5. Check the configuration of FileZilla Server: Ensure that the settings in the FileZilla Server configuration file are correct, including IP address, port, and user permissions.
6. Restart FileZilla Server: Try restarting FileZilla Server, as sometimes a simple restart can resolve some connection issues.

If none of the methods mentioned above work to solve the issue, you can try reinstalling FileZilla Server or contact FileZilla official technical support for assistance.