Docker outgoning traffic blocking
reddit / selfhosted

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Sky-Extra · 2023-12-22 07:23

Good morning,

I have a problem with Docker, maybe I could use your help ;)

I want to put a firewall in front of the containers. I have
deactivated the manipulation of the iptables. That fits so far now I
can create rules via "ufw". However, I want to allow outgoing traffic
on port 443. Can you help me? I can't get any further via ufw, all
outgoing traffic is allowed there. So I think it has to do with the
iptables. I found this command which should actually allow this

>iptables -I DOCKER-USER -o ${docker\_interface} -p tcp --dport 443 -j
ACCEPT

But I get an error message

>dockerino@docker:/opt/vizavy-mod$ iptables -I DOCKER-USER -o
${docker\_interface} -p tcp --dport 443 -j ACCEPT
>
>Bad argument \`tcp'

Can you help me and tell me what I am doing wrong or suggest another
way?

It is a Ubuntu 22.04 LTS system - only docker service