Need help with a specific firewall rule

[Vexz]

I think I found the culprit but I can't test right now because I have an appointment. I think it's DynDNS on my NAS. The IP behind its DynDNS domain changes to the public IP of my VPN server. This means clients from the internet try to access my NAS through the VPN tunnel which of course blocks the connection. Gotta do some testing later.

Nope, that sadly wasn't it. DynDNS gets the right public IP now but I still can't access my NAS from the internet.

The screenshot shows only the LAN rules. The interesting part would be the WAN rules.

There are no WAN rules.