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The original was posted on /r/selfhosted by /u/TheQuantumPhysicist on 2024-09-29 18:11:09+00:00.

I don’t know whether it’s a wish or something like this exists. But say you have a server where all connections have the firewall rule DROP, except for a few others, like ssh TCP 22, VPN UDP 1194, etc. Mistakes happen, and some times more ports are open due to a configuration mistake, but it’s important to notice.

Is there a tool that will keep hammering the server with connection attempts on random ports, and then if it finds something other than the ports I specify open, it would notify me somehow?

Quite frankly I was thinking I should write my own tool for this… part of me is sure that such tools exist.