Reply To: Fritz!Box 3490 Port 113 Closed (Not in Stealth) Ok, So I plugged back in my Fritz!Box 3490 yesterday and it is running the latest firmware (07.01) and have run a GRC SHIELDSUP (https://www.grc.com) test on the router to…

[Anonymous]

SOLUTION:

 

I had the exact same issue on a 7530AX Router and after trying a high number port that wasn’t used without luck I tried a server within the network. After ensuring iptables in the Linux Server was stealth for port 113 it worked!

Although many people may not have a running server already running, but if you do port forward TCP port 113 to that server within your LAN and make sure you add the iptables rull (save as well for reboot).

 

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