this post was submitted on 11 Oct 2024
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I want to set up ufw on my server, but something wrong here. Even when I trying to block 22 port ssh still working and nothing changing. I have ufw enabled, but nothing works.

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[–] [email protected] 7 points 3 weeks ago (2 children)

So you want to block port 22? Yet the rule you added allows access, or am I misunderstanding?

You probably need to be DENY instead of ALLOW if that's what you're wanting to accomplish.

[–] [email protected] 4 points 3 weeks ago (1 children)

This! You have it set to “Allow”, so it’s allowing it. You need to set it to Deny.

[–] [email protected] -2 points 3 weeks ago (1 children)
[–] [email protected] 5 points 3 weeks ago (1 children)

Is this a troll post or are you really struggling?

[–] [email protected] 1 points 3 weeks ago (1 children)
[–] [email protected] 3 points 3 weeks ago
sudo ufw delete allow 22

Is this a public facing server? If it isn't the online port port scanners will not work as they are scanning your public IP. Also they are unreliable in general. Best tool for the job is nmap. It has a ton of config options so you will need to do some reading. (Definitely worth the learn)

[–] [email protected] -1 points 3 weeks ago (2 children)

, no, I want to open, for example this port, but:

[–] [email protected] 7 points 3 weeks ago (1 children)

Do you have something listening on port 52038 that will respond to a port scan? If not it will report as closed.

[–] [email protected] 1 points 3 weeks ago* (last edited 3 weeks ago) (2 children)

It's my port for wireguard and here what I can't understand: when I blocking port for this wireguard service I still can use wireguard even if ufw deny it.

[–] [email protected] 5 points 3 weeks ago (1 children)

Wireguard appears as closed unless it receives the proper packet.

[–] [email protected] 1 points 3 weeks ago

that's what I looked for

[–] [email protected] 3 points 3 weeks ago (1 children)

Is wireguard incoming or outgoing from the machine you're trying to block it on?

[–] [email protected] 1 points 3 weeks ago (1 children)

outgoing, I guess. I mean, it's on my vps which I want to use for vpn

[–] [email protected] 2 points 3 weeks ago (1 children)

Make sure you're creating a block rule specifically on outgoing in that case.

[–] [email protected] 1 points 3 weeks ago (1 children)

when I just use ufw allow [port] command it'll not work?

[–] [email protected] 3 points 3 weeks ago

Outgoing should already allow everything, so no need to specifically allow it.

[–] [email protected] 4 points 3 weeks ago (1 children)

That's a website tool checking? It's almost certainly only going to check TCP, since most of them don't do anything with UDP because it's... more complicated.

You may need to find an alternate way to do that, something like iperf or netcat (nc -u ip port)

[–] [email protected] 2 points 3 weeks ago* (last edited 3 weeks ago)

nmap works great for this

traceroute might also be usable vith the -p switch I guess?