1. Check to make sure that your Internet connection is stable and active.
2. Check that your firewall, router and VPS settings are properly configured and up-to-date.
3. Power cycle your modem and router to make sure they are connected to your VPS.
4. Make sure all the cables and connections are secure and connected properly.
5. Check for possible IP conflict issues by resetting the router's IP settings.
6. Update the VPS’s operating system and drivers to the latest versions.
7. Check for any service interruptions caused by your internet service provider (ISP).
8. Contact your VPS provider for additional assistance in troubleshooting the issue.