I enable ufw and I tried to block all the traffic from one server, but I can't.

It only blocks ssh, all the other ports are open. I test it with telnet.

I want to allow all ports for some IPs, and block all ports if the IP is not there.

I have these rules:

sudo ufw status verbose

Status: active
Logging: on (low)
Default: deny (incoming), allow (outgoing), deny (routed)
New profiles: skip


Also, test from iptables

iptables --policy INPUT DROP

I tried telnet for ssh, is blocking but for other services, I can still access them.

Any ideas? I don't want to create default deny for outgoing, and then whitelist every port I want.


The problem is that the services are running inside the container. If I create a new listener with nc the firewall is blocking that connection.

How can I block the incoming traffic for containers?

  • Did you test from another machine? – ctrl-alt-delor Oct 25 '19 at 16:59
  • Yes, I test it from another PC also, with VPN. But still the port is open. – pioupiou Oct 25 '19 at 17:02
  • Can you describe what you tried in more detail? – jsb Oct 25 '19 at 18:10
  • I tried to block all the incoming traffic except from 2-3 IPs. But when i try to drop the input, same services they still listen. (Only ssh is really block) – pioupiou Oct 25 '19 at 18:22
  • How did you do that? If you block traffic from all IPs does it work as expected? ssh block might be due to the ssh config rather than firewall. – jsb Oct 25 '19 at 18:26

Assuming that the host you want to blacklist has an IP address of

$ sudo ufw deny from to any
$ sudo ufw reload

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