VPN (SonicWall) will not connect over T-mobile 5G Hotspot

I'm having same issue after switching to new iphone 15 (from iphone11). I'm unable to connect to corporate vpn through 5G hotsopt. If I try above steps to turn off the ipv6 in macos i'm unable to connect to the hotspot itself. So looks like T-mobile not support backward IPv4 comparability.

Not sure why T-mobile not fixing this issue as on other provider network we do not have this issue on 5G network.

ntdriverman wrote:

I found a post about turning off IPv6 on my WiFi connection on my Windows laptop that resolved this issue for me.

The issue I was having was that from my Windows laptop, I was NOT able to VPN into my workplace using my personal hot-spot thru my iphone 12 (I’m running iOS 15.1.1) using TMOBILE.

To resolve the issue, I had to disable IPv6 on my Wireless connection on my laptop.

Do disable IPv6 on my Wireless connection on my Windows laptop I did these steps:

1. Open “Network and Internet Settings”
2. Under “Advanced Network Settings”, Click on “Change adapter options”
3. It will bring up a list of Network connections, double click on the one that says “Wi-Fi”
4. In the new dialog box, click on “Properties” bottom left, do NOT click on “Wireless Properties”
5. The next dialog box will have a list of "This connection uses the following items”
6. Scroll down in that list to find “Internet Protocol Version 6 (TCP/IPv6)”, this will be in the list after the “Internet Protocol Version 4 (TCP/IPv4)”.
7. Uncheck the box in front of "Internet Protocol Version 6 (TCP/IPv6)". Leave the IPv4 checked.
8. Hit “OK”

After I did these steps I was able to use the VPN client (in my case it is the FortiClient VPN) and I was able to successfully VPN thru my hot-spot thru my TMOBILE service.

I also went back and retested using a normal WiFi connection (thru my home network) and everything still worked in that case too.

This works like a charm, quick and easy fix.

ntdriverman wrote:

I found a post about turning off IPv6 on my WiFi connection on my Windows laptop that resolved this issue for me.

The issue I was having was that from my Windows laptop, I was NOT able to VPN into my workplace using my personal hot-spot thru my iphone 12 (I’m running iOS 15.1.1) using TMOBILE.

To resolve the issue, I had to disable IPv6 on my Wireless connection on my laptop.

Do disable IPv6 on my Wireless connection on my Windows laptop I did these steps:

1. Open “Network and Internet Settings”
2. Under “Advanced Network Settings”, Click on “Change adapter options”
3. It will bring up a list of Network connections, double click on the one that says “Wi-Fi”
4. In the new dialog box, click on “Properties” bottom left, do NOT click on “Wireless Properties”
5. The next dialog box will have a list of "This connection uses the following items”
6. Scroll down in that list to find “Internet Protocol Version 6 (TCP/IPv6)”, this will be in the list after the “Internet Protocol Version 4 (TCP/IPv4)”.
7. Uncheck the box in front of "Internet Protocol Version 6 (TCP/IPv6)". Leave the IPv4 checked.
8. Hit “OK”

After I did these steps I was able to use the VPN client (in my case it is the FortiClient VPN) and I was able to successfully VPN thru my hot-spot thru my TMOBILE service.

I also went back and retested using a normal WiFi connection (thru my home network) and everything still worked in that case too.

As of yesterday, for me, this is no longer an option.  It appears that you can not disable IPv6 on a wifi connection. It completely looses connection.  Also unable to use ZScaler OR PIA VPN services.

Unfortunately I am going to have to leave T-Mobile over this.
Anyone else run into this just recently?

jmadison wrote:

ntdriverman wrote:

I found a post about turning off IPv6 on my WiFi connection on my Windows laptop that resolved this issue for me.

The issue I was having was that from my Windows laptop, I was NOT able to VPN into my workplace using my personal hot-spot thru my iphone 12 (I’m running iOS 15.1.1) using TMOBILE.

To resolve the issue, I had to disable IPv6 on my Wireless connection on my laptop.

Do disable IPv6 on my Wireless connection on my Windows laptop I did these steps:

1. Open “Network and Internet Settings”
2. Under “Advanced Network Settings”, Click on “Change adapter options”
3. It will bring up a list of Network connections, double click on the one that says “Wi-Fi”
4. In the new dialog box, click on “Properties” bottom left, do NOT click on “Wireless Properties”
5. The next dialog box will have a list of "This connection uses the following items”
6. Scroll down in that list to find “Internet Protocol Version 6 (TCP/IPv6)”, this will be in the list after the “Internet Protocol Version 4 (TCP/IPv4)”.
7. Uncheck the box in front of "Internet Protocol Version 6 (TCP/IPv6)". Leave the IPv4 checked.
8. Hit “OK”

After I did these steps I was able to use the VPN client (in my case it is the FortiClient VPN) and I was able to successfully VPN thru my hot-spot thru my TMOBILE service.

I also went back and retested using a normal WiFi connection (thru my home network) and everything still worked in that case too.

This worked for me, thanks for the help!  I also use FortiClient through my employer and couldn't connect via my iPhone hotspot.  Disabling the IPv6 as you detailed here worked!

Score! I was also stuck using my company-supplied VPN (FortiClient) and my IT department swore up and down that it must be T-Mobil that is the problem (well it is in the end...). This finally fixed my issue after trying to figure it out on my own for months on end. Last week I was sitting in front of an empty church glomming off of their unprotected wifi signal just so I could obtain a file from my company servers. No more! 

Camper123 wrote:

VPN (SonicWall) will not connect over T-mobile 5G Hotspot 

This vpn works fine with WFI but it will not work with the hotspot

using A71 Samsung 5G phone with T-mobile service and extra downloading (paying extra but not using this because it will not connect to VPN)

VPN software SonicWall

VPN was working a month ago and then the phone did an update and immediately the VPN stopped working

VPN hanging at acquiring ip

I bought this 5G phone as a hotspot for work and now it does not work at all with VPN.  :(

 

ntdriverman wrote:

I found a post about turning off IPv6 on my WiFi connection on my Windows laptop that resolved this issue for me.

The issue I was having was that from my Windows laptop, I was NOT able to VPN into my workplace using my personal hot-spot thru my iphone 12 (I’m running iOS 15.1.1) using TMOBILE.

To resolve the issue, I had to disable IPv6 on my Wireless connection on my laptop.

Do disable IPv6 on my Wireless connection on my Windows laptop I did these steps:

1. Open “Network and Internet Settings”
2. Under “Advanced Network Settings”, Click on “Change adapter options”
3. It will bring up a list of Network connections, double click on the one that says “Wi-Fi”
4. In the new dialog box, click on “Properties” bottom left, do NOT click on “Wireless Properties”
5. The next dialog box will have a list of "This connection uses the following items”
6. Scroll down in that list to find “Internet Protocol Version 6 (TCP/IPv6)”, this will be in the list after the “Internet Protocol Version 4 (TCP/IPv4)”.
7. Uncheck the box in front of "Internet Protocol Version 6 (TCP/IPv6)". Leave the IPv4 checked.
8. Hit “OK”

After I did these steps I was able to use the VPN client (in my case it is the FortiClient VPN) and I was able to successfully VPN thru my hot-spot thru my TMOBILE service.

I also went back and retested using a normal WiFi connection (thru my home network) and everything still worked in that case too.

This worked for me, thanks for the help!  I also use FortiClient through my employer and couldn't connect via my iPhone hotspot.  Disabling the IPv6 as you detailed here worked!

I had the same issue using the RG2100 5G hotspot. I found a work around by limiting the hotspot bandwith down from 5G to LTE only. Slower connect speeds but allows for VPN.

ntdriverman wrote:

I found a post about turning off IPv6 on my WiFi connection on my Windows laptop that resolved this issue for me.

The issue I was having was that from my Windows laptop, I was NOT able to VPN into my workplace using my personal hot-spot thru my iphone 12 (I’m running iOS 15.1.1) using TMOBILE.

To resolve the issue, I had to disable IPv6 on my Wireless connection on my laptop.

Do disable IPv6 on my Wireless connection on my Windows laptop I did these steps:

1. Open “Network and Internet Settings”
2. Under “Advanced Network Settings”, Click on “Change adapter options”
3. It will bring up a list of Network connections, double click on the one that says “Wi-Fi”
4. In the new dialog box, click on “Properties” bottom left, do NOT click on “Wireless Properties”
5. The next dialog box will have a list of "This connection uses the following items”
6. Scroll down in that list to find “Internet Protocol Version 6 (TCP/IPv6)”, this will be in the list after the “Internet Protocol Version 4 (TCP/IPv4)”.
7. Uncheck the box in front of "Internet Protocol Version 6 (TCP/IPv6)". Leave the IPv4 checked.
8. Hit “OK”

After I did these steps I was able to use the VPN client (in my case it is the FortiClient VPN) and I was able to successfully VPN thru my hot-spot thru my TMOBILE service.

I also went back and retested using a normal WiFi connection (thru my home network) and everything still worked in that case too.

THANK YOU THANK YOU for this post. My IT Department could not figure this out. I found your post, sent it to them and what do ya know? I was able to successfully connect to my work VPN from my hotspot on my iPhone 14!!!! 

NHJustin wrote:

So my situation was a little different since I was using a work laptop and Inseego MiFi hotspot and my work laptop is using Cisco AnyConnect Secure Mobility Client VPN. My work laptop locks down Network Preference Properties behind an admin account so I couldn't access any settings there. And the VPN only utilizes IPv4. However, I was able to get the Cisco VPN to work by logging into Inseego Web Admin panel. Once there, I navigated to Settings -> Advanced -> LAN -> IPv6 and unchecking the IPv6 box. Hope this helps someone! 

I will have to see if I can disable IPv6 on my P7Pro and test it. ¡Gracias! 
Still think T-Mo needs to step up and explain why they would block something that most business users would utilize. 

So my situation was a little different since I was using a work laptop and Inseego MiFi hotspot and my work laptop is using Cisco AnyConnect Secure Mobility Client VPN. My work laptop locks down Network Preference Properties behind an admin account so I couldn't access any settings there. And the VPN only utilizes IPv4. However, I was able to get the Cisco VPN to work by logging into Inseego Web Admin panel. Once there, I navigated to Settings -> Advanced -> LAN -> IPv6 and unchecking the IPv6 box. Hope this helps someone!