Forwarding UDP ports on FritzBox

Welcome Guest.

You haven't logged in yet. If you don't have an account you can register now.

Forums › 2degrees (including Slingshot, Orcon, Flip, Stuff Fibre, MyRepublic, 2talk and Vocus) › Forwarding UDP ports on FritzBox

xpd

Geek @ Coastguard NZ
13765 posts

Uber Geek

Retired Mod

ID Verified

Trusted

Lifetime subscriber

#303527 16-Feb-2023 12:40

Been running selfhosted servers etc for a number of years now, no issues really until now.... on 2D with static IP and the 2DM FritzBox.

Everything running fine except a new server I'm wanting to put online - it uses UDP only. So I have enabled forwarding the required ports etc but for some reason noone can connect. Been chatting with the devs and they cant see anything wrong on the server side of things via the logs.

Anyone else run UDP only servers on a Fritz and encountered any issues like this ?

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

LinkTree

michaelmurfy

meow
13243 posts

Uber Geek

Moderator

ID Verified

Trusted

Lifetime subscriber

#3037554 16-Feb-2023 12:55

Just remember - port forwarding does open up your network. I'm just remembering the time you had a server compromised.

But it is honestly as simple as opening it up via Permit Access just like how you forward TCP. If you have been migrated over to the Vocus network then you'll also have Port Filtering: https://www.2degrees.nz/help/broadband-help/troubleshooting/port-filtering

In your Fritz!Box logs you can see if you've been migrated by either the broadband PoP showing "SNAP-xx" (meaning you're on the old 2degrees network) else a Vocus broadband PoP:

Michael Murphy | https://murfy.nz
Referral Links: Quic Broadband (use R122101E7CV7Q for free setup)

Are you happy with what you get from Geekzone? Please consider supporting us by subscribing.
Opinions are my own and not the views of my employer.

xpd

Geek @ Coastguard NZ
13765 posts

Uber Geek

Retired Mod

ID Verified

Trusted

Lifetime subscriber

#3037621 16-Feb-2023 13:48

LOL, that time I had issues was due to an update changing a SMTP relay setting on the hMail server back to default :D Youve got a good memory ;)

Yeah, used the Permit Access to open them up, but anytime anyone tries to connect, just gives server not responding message. Yet server responding fine on LAN.

If I have no joy, no biggie, will get someone else to host it (hopefully) :) Might even fire up another PC just to test it with to ensure its not a Windows issue.

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

LinkTree

michaelmurfy

meow
13243 posts

Uber Geek

Moderator

ID Verified

Trusted

Lifetime subscriber

#3037622 16-Feb-2023 13:51

You ensured it is opened up in Windows Firewall? :)

Make sure both are ticked for the service you're opening up.

xpd

Geek @ Coastguard NZ
13765 posts

Uber Geek

Retired Mod

ID Verified

Trusted

Lifetime subscriber

#3037793 16-Feb-2023 16:47

Either something weird going on with this router, or some update has changed things......

Figured I'd remove all permits/sharing, and start afresh. Did that, but now when I add a port, its only opening IPv6, and not IPv4.

Or at least thats what its showing.

Arghhh....

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

LinkTree

xpd

Geek @ Coastguard NZ
13765 posts

Uber Geek

Retired Mod

ID Verified

Trusted

Lifetime subscriber

#3037797 16-Feb-2023 16:53

Oh ffs.... now whats it doing.... The desktop is my main PC. Its got nothing to do with the port forwarding.

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

LinkTree

xpd

Geek @ Coastguard NZ
13765 posts

Uber Geek

Retired Mod

ID Verified

Trusted

Lifetime subscriber

#3037800 16-Feb-2023 17:03

Change it to IPv4 only, and it maps to my desktop. Change to 4 and 6, 4 goes to desktop and 6 goes to server.

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

LinkTree

Spyware

3762 posts

Uber Geek

Lifetime subscriber

#3037832 16-Feb-2023 18:34

xpd:

Oh ffs.... now whats it doing.... The desktop is my main PC. Its got nothing to do with the port forwarding.

One would think that you are in the wrong section.

Spark Max Fibre using Mikrotik CCR1009-8G-1S-1S+, CRS125-24G-1S, Unifi UAP, U6-Pro, UAP-AC-M-Pro, Apple TV 4K (2022), Apple TV 4K (2017), iPad Air 1st gen, iPad Air 4th gen, iPhone 13, SkyNZ3151 (the white box). If it doesn't move then it's data cabled.

Wise

Send money globally for less with Wise - one free transfer up to NZ$900 (affiliate link).

michaelmurfy

meow
13243 posts

Uber Geek

Moderator

ID Verified

Trusted

Lifetime subscriber

#3037833 16-Feb-2023 18:41

xpd:

Change it to IPv4 only, and it maps to my desktop. Change to 4 and 6, 4 goes to desktop and 6 goes to server.

If you've got UPnP enabled there is a chance that it is mapped to the desktop already by that. As you know with IPv4 you can only map a port once on NAT.

Try disabling UPnP if you've got that turned on and give it another shot.

xpd

Geek @ Coastguard NZ
13765 posts

Uber Geek

Retired Mod

ID Verified

Trusted

Lifetime subscriber

#3037921 16-Feb-2023 20:34

Right, fixed the issue, back to my original problem :D

Issue was that for some reason, the Fritz was using my desktop name to do access rules, but after I went into the network settings and removed the desktop, it came right....... weird.

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

LinkTree

xpd

Geek @ Coastguard NZ
13765 posts

Uber Geek

Retired Mod

ID Verified

Trusted

Lifetime subscriber

#3037996 17-Feb-2023 07:23

All fixed. Looks like removing all devices from the Fritz network sorted it out - existing forwards were fine, but anything new was getting mapped to my desktop and not the server - why ? Who knows. :)

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

LinkTree

News and reviews »

Air New Zealand Starts AI adoption with OpenAI
Posted 24-Jul-2025 16:00

eero Pro 7 Review
Posted 23-Jul-2025 12:07

BeeStation Plus Review
Posted 21-Jul-2025 14:21

eero Unveils New Wi-Fi 7 Products in New Zealand
Posted 21-Jul-2025 00:01

WiZ Introduces HDMI Sync Box and other Light Devices
Posted 20-Jul-2025 17:32

RedShield Enhances DDoS and Bot Attack Protection
Posted 20-Jul-2025 17:26

Seagate Ships 30TB Drives
Posted 17-Jul-2025 11:24

Oclean AirPump A10 Water Flosser Review
Posted 13-Jul-2025 11:05

Samsung Galaxy Z Fold7: Raising the Bar for Smartphones
Posted 10-Jul-2025 02:01

Samsung Galaxy Z Flip7 Brings New Edge-To-Edge FlexWindow
Posted 10-Jul-2025 02:01

Epson Launches New AM-C550Z WorkForce Enterprise printer
Posted 9-Jul-2025 18:22

Samsung Releases Smart Monitor M9
Posted 9-Jul-2025 17:46

Nearly Half of Older Kiwis Still Write their Passwords on Paper
Posted 9-Jul-2025 08:42

D-Link 4G+ Cat6 Wi-Fi 6 DWR-933M Mobile Hotspot Review
Posted 1-Jul-2025 11:34

Oppo A5 Series Launches With New Levels of Durability
Posted 30-Jun-2025 10:15

Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.

Updates »

Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

RSS feeds: Main feed; Forums feed

Site features: Geekzone BI dashboard; Geekzone Badges; Geekzone Status Page

Affiliate links: Samsung; AliExpress; Wise; Sharesies; GoodSync

Site Information: Subscribe to Geekzone; Privacy Statement; Forum Usage Guidelines (FUG); Advertising; Trademark and copyright