FYI : IPv6 Prevented VPN Connection

Anvil_Iron · ‎07-07-2023

My wife uses VPN for work and one day she wasn't able to connect. I checked the router (Zyxel NR5103E) web-config and noticed the Primary/Secondary DNSv6 server addresses info were present which weren't before.

I tried disabling IPv6 in the WAN and LAN settings but internet service stopped.

I then enabled manual APN mode and changed from 3internet to Three.co.uk and restarted the router. After restart, the IPv6 info was N/A and the VPN was able to connect. VPN also connected when APN was set to 3internet with manual APN enabled.

The strange thing was when APN Manual Mode was disabled and router reset, IPv6 info was displayed. It looks like the router was obtaining IPv6 and IPv4 info from Three if manual APN mode is disabled. This could be the PDP Type being set to IPv4/IPv6 automatically by Three where as in manual APN mode, I have it set to IPv4 only.

NG · ‎07-17-2023

Update: Anvil_Iron is the man!!!

To add a little detail to help the more ignorant like me:

First, log in to the hub from a browser ideally on your laptop (or I guess phone), not the hub app. (ie, 192.168.1.1/login, logging in as admin)

1) under top-right burger menu-->Network Settings-->Broadband-->Cellular APN, I set to manual so it ended up as follows:

And under Burger menu-->Network Settings-->Home Networking-->Lan Setup, click on the 1st APN setting in the list (on the right-hand side where you click to edit), then

I then rebooted the hub, confirmed settings remained as above, and rebooted my devices (including network switch). Audio player and speaker when connected to my network switch do show up on hub app both under Wi-Fi and LAN as expected.

... AND I'M NOW LISTENING TO MY PINK FLOYD ALBUM ONCE AGAIN!!!!!

Thanks again Anvil_iron!!

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GF · ‎12-04-2023

Huge thanks, this fixed the issue for me I'd been having on the Huawei B535 for the past month or two. Launchbox was refusing to download anything (updates, metadata etc) from their servers, and Windows was refusing to do something as basic as set the system time automatically as it couldn't connect to the servers either.

For anyone using the B535, login (if you can, due to expired certificates that Three still hasn't fixed either) and go to Network Settings. At the bottom of the first page click '+' on the Profiles section to add a new profile. Just type 'three.co.uk' in APN field and leave everything else blank. Save it, restart router, and if you go to Advanced - System - Device Information, the IPv6 field should say 'unknown'. At this point, all your programs should start working normally again.

Ridiculous incompetence at Three that this issue hasn't been fixed and they refuse to accept responsibility. Happily I'm out of contract and FTTP with Fibrus is only a few weeks away from being available here.

andrewbrisland · ‎02-16-2024

A friend of mine suggested Fibrus but they are unavailable in my postcode 😞

Mr_P83 · ‎11-24-2023

Absolute superstar. This has solved my problem 100%. Not been able to connect my work VPN Forticlient for ages. Three tech support were useless. @Anvil_Iron Three should employ you as Tech Guru! This also fixed the problem of my kids Nintendo Switch not being able to connect. Thank you @Anvil_Iron.

digitaltoast · ‎12-04-2023

Thanks indeed to @Anvil_Iron - not only has it resolved ALL my issues, but broadband is significantly faster with lower latency after switching APN to three.co.uk.

Now my Fire TV stick, security cameras and internet banking all work perfectly - but how many users of Three will know either about this forum or how to make this change? And why is it taking SO LONG for Three to acknowledge and fix the problem?

Could @JonathanB perhaps collect all the many, many related threads on this subject and find the right person at Three to give us an official answer, explanation and update?

Thanks!

456 · ‎12-04-2023

Hi there.

Is that all that's needed - just to change the APN to three.co.uk? Anything else?

456 · ‎11-30-2023

Still no fix for my issues (disconnects, slow speeds) - and it's now been a year.

Does anyone know what the fix is so there are NO disconnects, the router accepts IPv4 connection requests from my home devices and the speed is not affected?

BJ292 · ‎11-05-2023

Thanks for this. Worked a treat to get my Blink camera working again.

456 · ‎10-28-2023

Can SOMEONE from Three respond and sort this out? Issues for almost ONE YEAR NOW. 😢 @JonathanB

SerenaJoy · ‎10-27-2023

Same issue here - suddenly stopped being able to connect on Sunday, using Cisco AnyConnect. Other half is using Forticlient VPN with no issues. I’ve logged into the router using default password and although I can see advanced settings I don’t seem to have the same options as others on this thread - no option to switch APN to manual. Any help appreciated, working from home has been virtually impossible all week

Storm-14 · ‎10-08-2023

Just wanted to say thank you. This issue started out if nowhere the other day. After months of playing ps5 just fine. Following your steps solved the problem when nothing els did. Your a legend