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...

[Grisu]

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[UK Sentinel]

Thanks for letting us know, has port 113 on your Fritz!Box caused you any concerns or the owners of Fritz!Box in Austria etc ?

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[Grisu]

Simply no.

And it is explicitly mentioned in AVM-help: https://service.avm.de/help/en/FRITZ-Box-7590/019/hilfe_internet_filter_listen

Dont know, but possibly AVM may use it to see whether your modem is up and running (at least online on your DSL-line) for MyFritz-Service.

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[UK Sentinel]

Thanks for the links to AVM publications,

It would be nice if AVM would allow the Stealth of Port 113 and ICMP requests to be an option (Yes/No) radial buttons.

It was reported that Linksys has made port 133 Stealth optional due to customer concerns.

https://www.grc.com/port_113.htm

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[UK Sentinel]

Ok, so I have sent AVM an email suggesting for Port 113 to have a check box for STEALTH option etc.

Will be interesting to see if they (AVM) come back to me on this

 

https://en.avm.de/contact/suggestions-for-fritz-products/

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[UK Sentinel]

Had this response from AVM this morning regarding Stealth Port 113 request and has been translated via Google.

Standard response I believe, but does indicate the more owners ask for a feature, the more it will be considered ?

——

Hello xxxx xxxx,

Thank you for your kind feedback. Your request has been received as Suggest improvement to the responsible product manager in-house AVM. Whether and, if applicable, when an implementation will take place, is
at this stage, however, it is not yet clear. But in general, of course, that our products of demand and suggestions for improvement/Customers’ wishes “live”, so have already been numerous suggestions for improvement have been implemented (not infrequently already
directly in the next version)

Another tip:
With the AVM newsletter, you will be quickly informed about the availability of Updates and/or deployment of lab versions. This You can subscribe to our newsletter at http://avm.de/service/newsletter/ and log off again if necessary.

Kind regards from Berlin

Tim Luhmann

AVM GmbH distribution

———

 

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[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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[UK Sentinel]

Welcome and great suggestion if you are running a LAN based Server or Linux Pie Box.

Fritz!Box’s are dependable routers and such a shame this one feature (Stealth Port 113) has not been allowed for the more paranoid amongst us (myself included)

In a completely sane world, madness is the only freedom (J.G.Ballard).

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[Author]

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