I have seen several posts about VPNs not working with T-Mobile Home Internet. What is T-Mobile's plan to address this? I contacted my corporate IT department and they said it's not their VPN. All works fine on my old ATT home internet and Verizon Hotspot (work cell). Maybe I should drop T-Mobile Home Internet and go back to ATT.

SOLVED! After days with my IT department and then with Global Protect in Pali Alto, here's the bottom line. T-Mobile High speed broadband can't handle IPv6 dynamic IPs therefore can't communicate in internet. Global Protect can only handle IPv4.There are no settings on T-Mobile gate way to make it just use IPv4.Global Protect doesn't have a fix/VON software to fix this advanced IPv6 communication I can access my company's server for data files, outlook for email etc, but cannot access internet based apps like one login or any websites. Except MSN.com - explain that. Not even Google. Com.Have to switch to my Verizon cell data hotspot to my company laptop to access internet. Then switch back to T-mobile when done with internet T-Mobile is using advanced technology that companies are not ready to handle, and will take them a long time to become compatible.Since most users don't have IOv6, there's no rush to upgrade corporately. For example, they advise that all the scanner guns in our warehouse aren't compatible with IPv6, so if they upgrade VPNs now, none of the equipment would work in the warehouse.Nor are VPN providers putting resources into IPv6 compatibility.im so annoyed that I switched to the T-Mobile high speed broadband new technology that NO ONE at T-Mobile advised this would be an issue. Even calling tech support, they had no idea what the issue would be. After my IT department figured it out I HAD TO CALL BACK T-MOBILE AND BRUNG THEM UP TO SPEED. Am I in the twilight zone? Ridiculous So much for all this infrastructure across the US. If we get this new technology, then can't connect with old technology being used by 99% of corporations, then we're screwed until they decide to upgrade.How can this be such a mystery in 2021. IPv6 has been in development for more than 10 years. WHAT's the holdup and lack of warning of the issue.So annoyed that I switched to this with no heads up. I'm screwed now unless I switch back to my unreliable Cox cable internet that had service outages at least twice a week while I've been working from home.

Just got my new T Mobile gateway and set it up. Exact same issue with exact same VPN. Nothing works on it!

I can confirm that lowering MTU worked for me. I set it to 1300.

Well looks like two years later and this is still an issue… Tried calling T-Mobile tech support and they couldn't downgrade or upgrade my firmware. So they put in a ticket to engineering. Fingers crossed.

No luck so far. I even had T-Mobile roll back the version of my gateway's firmware, because I had heard that fixed the problem for some people. The service rep said he couldn't do it, but when I said I needed to cancel my service then, suddenly it became possible. It did get a little better, some web pages eventually load, but it's still not usable.I have one last thing to try. There are some people who say lowering the MTU setting for globalprotect to 1350 or less might solve the issue. I doubt it will work, but I'm going to try it. I don't have access to do it myself, but I'll try to get the IT guys to do it when I'm in the office on Tuesday. If you have admin access on your machine you can try it yourself:netsh int ipv4 set subinterface "Ethernet 2" mtu=1350Replace "Ethernet 2" (keep the quotes) with whatever name your computer uses for the globalprotect virtual interface in ipconfig.

GlobalProtect VPN not working with T-Mobile

Sergiosc22
Roaming Rookie
Hace 11 meses
Venkatcyclops wrote:

Thats great. I tried that, but it didn't work. I first tried the 1300, did not do anything, but when I changed it to 1350 it worked for a couple of minutes. After that it didn't. No Internet when connected to LAN.

What happened to me was that at some random moments, MTU moved back to what it was, so I had to change again
VPN_on_5G
Newbie Caller
Hace 11 meses
I spoke with a T-Mobile support person on 19-FEB-2024 who said the MTU setting needs to be 1300. This is what I did and it works for me (W10); your mileage may vary.
Disconnect from GlobalProtect VPN

Open Windows Control Panel

Open Network and Sharing Center

Click Change Adapter Settings

Right-click the ethernet connection with the subheading PANGP Virtual Ethernet Adapter Secure

Select Properties

Click Yes

Click Configure

Click the Advanced tab

Click MTU

Change the value to 1300

Click OK

Close all windows

Connect to GlobalProtect VPN and wait several minutes to ensure you don’t lose internet connectivity
- jenvickerman
  Newbie Caller
  Hace 24 días
  Thanks, VPN_on_5G, This seems to have solved my issue that just sprung up last week after using GlobalProtect VPN and my T-Mobile Home Internet since the beginning of September. Here's hoping it continues to work!
emailtoashah
Newbie Caller
Hace 3 meses
I am using the global protect and having the same issue with T - Mobile hotspot on my work mac.
I am using GP 6.3.0-33 version. It used to work in some areas when I was traveling but now I am home and it doesn't work at all.

Any help from T-Mobile team is appreciated.

Ankit Shah
Rich_T
Newbie Caller
Hace 4 años
Thanks for the info, KnappTime2515. I have the same problem and I think knowing that IPv6 is the problem might let me fix it. I'm using my own router between the T-Mobile gateway and my computers. I think maybe having my router accept IPv6 traffic but use IPv4 on the LAN might work around the problem. If you have a router available, you might want to try the same thing. It would be really nice if T-Mobile gave us the option of not using IPv6, though.
Redwallone
Network Novice
Hace 4 años
Just got T-Mobile internet to replace my art 4g internet. Same issue. Will not work with global protect.

did T-Mobile provide any kind of update. The speed is way better than att but if I can't use it for work sending back the router and cancelling the service.

interesting I did ask them about restrictions with vpn’s as I encountered that problem with satellite and they did not raise this issue.

just curious if the router solved the problem.
Redwallone
Network Novice
Hace 4 años
I contacted T-Mobile support. They indicated the software on my router had been updated to latest version which had issues with global protect. They rolled me back to previous version and it started working. It took 2-3 days, but I have been using it since Friday and all seems to be working.

not sure if they did anything else that I am not aware of.

hope this helps.
Rich_T
Newbie Caller
Hace 4 años
It took a while, but I finally got my IT dept to lower the MTU for me. They refused to use netsh for some reason, but they were able to set it through group policy, or maybe it was a registry setting, I forget. Anyway, they set it to 1350, and everything seems to be working now.
HopefullyThisWo
Roaming Rookie
Hace 4 años
This is strange. My trash can is on firmware .0178 and my company uses GlobalProtect VPN and I'm able to connect every day without any problems. Occasionally a page will fail to load and I have to refresh a few times, but that's the only issues I've noticed. In fact, it wasn't until my trash can upgraded to .0178 that I was even able to connect to my work VPN.
Maybe it’s a setting on your company’s VPN and not T-Mobile? \_0_/
KnappTime2515
Roaming Rookie
Hace 4 años
Trash can?
it depends if your company infrastructure is ready to handle IPv6
HopefullyThisWo
Roaming Rookie
Hace 4 años
"Trash Can" = the grey, cylinder modem/router from T-Mobile lol. It looks like a trash can