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Firewall common errors

The firewall right now is managed by iptables (or iptables-nft) and ip6tables (or ip6tables-nft). Some common errors with their resolution are listed below.

Table does not exist (do you need to insmod?)

Raspberry Pis

This is common on Raspberry Pis.

If you encounter the error:

iptables v1.8.4 (legacy): can't initialize iptables table `filter': Table does not exist (do you need to insmod?)

You likely need to update your system with rpi-update, see #400 for more information.

Podman

Podman might need the extra capability NET_RAW added to Gluetun, on top of NET_ADMIN.

Permission denied (you must be root)

If you use Portainer to run the container and get the error:

2020-05-03T09:04:11.283Z ERROR failed executing "-P INPUT ACCEPT": iptables v1.8.3 (legacy): can't initialize iptables table `filter': Permission denied (you must be root)
Perhaps iptables or your kernel needs to be upgraded.: exit status 3```

This might be because Portainer does not set the --cap_add=NET_ADMIN successfully.

You might need to run the container without Portainer in this case. More information on #139.