can't connect to forwarded ports after a reboot

[x140x1n]

I have rebooted my router yesterday without making any changes to a working configuration and after all my forwarded ports were no longer working.
I have checked the firewall settings and the forwarded ports but I can't find anything which might be causing the issue.
Since nothing changed since it was working all I could think of was to restart the modem which is in bridge mode without any result. Everything behind the router can access the internet without any noticeable issues.
I did a portscan and everything that should be open appears to be stealth.

Anyone have some suggestions on what to check here?