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My server is being abused by someone with a large number of computers. I noticed they're all running on the same port, so to be clear, I'm getting incoming requests from:

some-ip1:3333 some-ip2:3333 some-ip3:3333 ...

And no matter how many IPs I block individually, a new one just keeps coming back but from a new IP but from the same port number. How can I use UFW to block any incoming request from a specific port number, but from any IP address?

ufw deny [port] doesn't work because that blocks people from accessing MY port 3333, and ufw deny in/out [port] seems to do the same thing.

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I think you can do something like:

ufw deny from 0.0.0.0 port 3333

http://manpages.ubuntu.com/manpages/zesty/en/man8/ufw.8.html https://help.ubuntu.com/community/UFW#Services

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  • Note to future readers: I edited my answer, so "second one did it" in @deRadd comment refers to the only ufw line in the answer Commented Jan 25, 2017 at 22:34

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