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I have had a VPS in NL for the past 5-6 years and it's been working great. Now one day I suddenly can't access/ping/anything the VPS from my home connection (tried different computers)

The confusing part is that accessing the server works great when I go directly to the sites I have hosted on it (because they are behind Cloudflare's CDN proxy) or when I try to access the server at work it works good too.

The question is how the heck do I figure out if its my home connection/ISP/router blocking the connection to the VPS or if its the VPS company/software blocking connections FROM my home connection?

Is there any skilled sysadmins out there that can guide me here? I am currently really confused as to where the problem lies.

binnathon
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1 Answers1

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Start a packet capture on the client and the server and test everything.

  • All ISPs available, fixed line and mobile, work and home.
  • Use a VPN service to come in from a different provider.
  • Determine routes to the instance
    • From your client with traceroute
    • From a different ISP by using a looking glass server
  • Review all firewalls and access control lists.
    • At the host level ufw and fail2ban, for example
    • Possibly you have access to firewall services ("security groups") on your infrastructure

If you find proof an ISP isn't getting you were you need to go, open a support ticket with them.

John Mahowald
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