Comment # 8 on bug 1233690 from Alexandre Vicenzi

Restarting Docker service usually recreates iptables rules:

> sudo systemctl restart docker

Can you test if a restart fixes anything?

You can also reset all iptables rules to get rid of possible corrupted rules,
but be aware that this resets everything, I recommend backing up any rules
before you proceed. If you are in a ssh session you can get locked out if you
reset iptables.

A backup or snapshot is recommended to not lose any data before you proceed.

To reset iptable rules:

> sudo iptables -F
> sudo iptables -X

To recreate docker rules just restart the service as shown before.