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

MichiganUser03
Newbie Caller
Hace 4 años
KnappTime2515 wrote:

Fixed immediately … T-Mobile tech rep advised they need to downgrade my gateway firmware and they set to stop automatic update to prevent reverting to the update. Fixed it immediately. Unreal that he was only T-Mobile rep who had this knowledge,

needed to downgrade to ..,,168 from ..,178

see below

WRONG;

Correct firmware version:

This solved my problem and the T-Mobile rep took care of this very quickly for me when I called and asked to have my firmware update rolled back. Thanks for sharing!!!
agemp
Roaming Rookie
Hace 4 años
Not sure I understand the why??but all webpages and my cloud providers load just fine for me? I have private Internet access as a VPN and have no problems, download speeds are slowed down a bit with the VPN on but that was true with my last service provider.
Superfly
Network Novice
Hace 4 años
I'm experiencing this same issue and it seems there are two possible solutions -- 1. Get my corporate IT to drop GlobalProtect's MTU setting to 1300, or 2) Get T-Mobile to roll back the gateway firmware version to 168 (and turn off firmware auto-updates).
Is one solution better than the other? Do both? Go back to Cox?
Advice appreciated,
Superfly
Grkrican
Network Novice
Hace 4 años
Lowering the MTU to 1350 worked for me !
Superfly
Network Novice
Hace 4 años
I ended up calling T-Mobile support, and was pleasantly surprised to be quickly connected to a knowledgeable support rep. who instantly -- as soon as I said the words "GlobalProtect VPN" -- knew what to do. He rolled back my firmware to the prior version (168) and my issues immediately resolved.
djb14336
Bandwidth Buddy
Hace 4 años
With any luck the new firmware they started rolling out last week will finally resolve the VPN issues.

Now if they could just put a proper dual-stack configuration in place so port forwarding would work....
kumar_vinnu
Network Novice
Hace 4 años
I had the same issue as everyone was saying. I called the support, they rolled back firmware version to 0168 on the device. But i still not able to access internet while i am on VPN. I am able to connect but unable to access internet over VPN.
puipui00
Newbie Caller
Hace 4 años
GlobalProtect-PlayNICE wrote:

Change Windows MTU Size

3. As mentioned on the above replies. credit Rich T, Type the following:

netsh int ipv4 set subinterface “Ethernet 2” mtu=1300 store=persistent

Replace “Ethernet 2” (keep the quotes) with whatever name your computer uses for the globalprotect virtual interface in ipconfig.

Confirmed this one works on Cisco Meraki VPN. My VPN was connecting intermittently. When connected, download speed was only ~45kbps. It was enough to see files on the network but took forever to download anything, and was unable to load any website. Once I changed the mtu size from the default 1400 to 1300, everything works just fine. My gateway has .178 firmware.
popo-21
Network Novice
Hace 4 años
My symptom was a little unique, but it might help somebody else with the same issue.
I was able to successfully connect thru GlobalConnect, however occasionally I would lose internet connectivity. Of greater importance, I was unable to maintain a RDP connection to Windows Servers (2016 and 2019). I could connect to the server, however it would drop after 20-30 seconds. RDP connections to Workstations running Windows10 worked fine.
T-Mobile support downgraded my firmware to .0168 (as mentioned above). My RDP sessions are now working as expected.
Also as mentioned above, as soon as I said “Global Protect” to the T-Mobile support person, they immediately knew what to do (downgrade the firmware).
crouchingtigerh
Roaming Rookie
Hace 4 años
I just received my Gateway over the weekend & ran into this problem w/GlobalProtect this past Monday. Microsoft Outlook & Teams worked fine, but no web access. As of Tuesday, the 24th, at least here in the Washington, DC, area, T-Mobile's solution is still to roll back the firmware.