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

Is this a troll post or are you really struggling?

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

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

[–] [email protected] 6 points 1 month 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 1 month ago* (last edited 1 month 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 1 month ago (1 children)

Wireguard appears as closed unless it receives the proper packet.

[–] [email protected] 1 points 1 month ago

that's what I looked for

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

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

[–] [email protected] 1 points 1 month ago (1 children)

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

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

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

[–] [email protected] 1 points 1 month ago (1 children)

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

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

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

[–] [email protected] 4 points 1 month 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 1 month ago* (last edited 1 month ago)

nmap works great for this

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