Question

GlobalProtect VPN not working with T-Mobile


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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.


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Ugh! Just got my T-Mobile 5G Internet Gateway and it came with .0178 software version. Internet speeds are great at 500 down and 50 up! (Los Angeles area btw)

However, I am having the Global Protect VPN issue where it connects but I can’t use Remote Desktop to my office computer or access any of our internal sites.

After reading posts on this forum, I called T-Mobile Support to upgrade my firmware version to the newer .1609 version. They told me it may take up to a day. Keeping fingers crossed that the new .1609 version fixes the Global Protect VPN issue!

 

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Just checked this morning and I see that my T-Mobile Internet Gateway is now on the newer 1609 version. My GlobalProtect VPN now works with no issue (so far)! <knock on wood> I am now able to use Remote Desktop to my desktop computer in the office as well as access internal work sites.

Got my Tmobile Home Internet yesterday and having same issue, will call Tmobile to rollback the firmware for Global VPN fix. Any issues on network speed by rolling back the firmware?

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Got my Tmobile Home Internet yesterday and having same issue, will call Tmobile to rollback the firmware for Global VPN fix. Any issues on network speed by rolling back the firmware?

No need to rollback. Update to the latest 1609 version instead.

Got my Tmobile Home Internet yesterday and having same issue, will call Tmobile to rollback the firmware for Global VPN fix. Any issues on network speed by rolling back the firmware?

No need to rollback. Update to the latest 1609 version instead.

Yes, called Tmobile and updated my firmware to .1609 and Global VPN works now.
But I do notice that my speed is reduced when connected to the Global VPN, download speed reduces by a factor 2x and upload speed reduces by a factor of 10x. So when working on my remote desktop through VPN connection it is choppy/laggy.
Hoping this is a temporary issue hate to switch back to spectrum as Tmobile is faster and cheaper.  

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Got my Tmobile Home Internet yesterday and having same issue, will call Tmobile to rollback the firmware for Global VPN fix. Any issues on network speed by rolling back the firmware?

No need to rollback. Update to the latest 1609 version instead.

Yes, called Tmobile and updated my firmware to .1609 and Global VPN works now.
But I do notice that my speed is reduced when connected to the Global VPN, download speed reduces by a factor 2x and upload speed reduces by a factor of 10x. So when working on my remote desktop through VPN connection it is choppy/laggy.
Hoping this is a temporary issue hate to switch back to spectrum as Tmobile is faster and cheaper.  

Most VPNs adds overhead to the internet connection that usually slows down your internet speed throughput. Maybe ask your work if they can enable split-tunneling for their VPN? That might help with the internet speed throughput reduction with VPN.

Try lowering you MTU value on the VPN connection. I could connect with Global Connect and use network resources, but couldnt use internet or teams video while connected. Which really sucked as some of our stuff is web based. So I was constantly connecting and un-connecting to VPN depending on what info I needed, and where it was (web or office network) After running a ping test, I had to lower my MTU to around 1340 from the default of 1500. Once I did that, I stopped losing internet connection everytime I connected to VPN, and video in Teams worked as well. I stay connected to VPN for my work day with no issues now. I noticed that even outside of VPN, the router doesnt accept the default 1500 MTU size. I lowered it to around 1460 I believe. Not a lot, but it stopped the bottleneck at the router. I have the latest firmware for comparison.

for Windows, go to a command prompt and type this in

ping www.yahoo.com -f -l 1500

If it comes back saying fragmented, run it again dropping it to 1400. Keep dropping it until the ping successfully completes. Then move the value back up by 10 until it fragments again. Then back it down by 1 or 5 until it completes again. Once you find it, that is the optimum MTU value your router will successfully pass while running VPN. Anything larger, and you will get a packet bottleneck at the router, degrading some of your services like internet etc.

look up how to change the MTU value on the network interface once you find it. Make sure you run the test WHILE VPN is connected, as that interface is only running while connected to VPN.

Just tried changing the MTU for my Ethernet and WiFi to 1300 and it worked! Thanks for the tip! You either have to get your IT to go in and do it on your computer or if you have Admin rights on your computer like i did you can go in to the command prompt and follow the steps GlobalProtect-PlayNICE listed earlier

I had this issue in August 2021, and getting my IT department to lower the MTU to 1350 worked (I had the .0178 firmware version) for my GlobalProtect VPN.

My firm recently switched to our VPN being “always on” - i.e. we didn’t have to connect to it separately after logging in to the computer. The issues with GlobalProtect returned - so basically no internet-based application worked on my computer even though it was connected to my T-mobile wifi.

 

My T-mobile firmware automatically upgraded to firmware version 1.2103.00.0338 and there are no longer any issues with GlobalProtect :) 

How can I tell which firmware version I’m on? I looked in the TM Home Internet app under More→ Gateway Info and it says my version is 1.00.16. That doesn’t look like anything others are posting. 

@kiki25, is your MTU still lowered to 1350?

Thanks!

I am on *338 firmware and data traffic via VPN  (via Global Protect) does not work. I tried changing MTU size to value which works with pings (and below) and still no help. Once I disconnect from VPN (used mostly for remote work), everything fine . 

I’ll be calling T Mobile support tomorrow. Not sure what to tell them.

 

A fix here...hopefully I can help. I have the square 5G Home Internet Gateway. 

 

I was close to modifying the MTU size as discussed in previous posts. Spoke to Ali from T-Mobile Support and he took some time with me.

 

Any speedtest through the Global Protect client was getting .2M up and .2M down. Internal business sites for my work over the VPN performed horribly...wouldn’t even come up. Support had me logon to the 5G gateway from another device like my iPad (usually browsing to http://192.168.12.1). Go to Wi-Fi Networks, Logon...Password should be on the bottom of the gateway device. 

Split the wireless network in 5GHz and 2.4GHz. Save the configuration. Then attach to the the SSID for 5GHz. Global Protect VPN worked like a champ. 

Thanks T-Mobile Support!

 

 

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