Here are the steps to diagnose and resolve the issue with your VPS internet connection:

1. Check the status of your VPS server with the service provider.
2. Check the settings of your VPS to ensure that all of the ports are open.
3. Restart the VPS to see if that will help the connection.
4. Check the DNS settings of your VPS and make sure they are configured correctly.
5. Ensure that your router and modem are on the same subnet as your VPS.
6. Contact the service provider if all else fails.