Cisco AnyConnect VPN issue with T-Mobile

I’m right there with you since thanksgiving of 2022 I had been with T-Mobile internet since Feb 2022 no issues but all of sudden Cisco jabber vpn connects then disconnects every 5 mins I have to restart and unplug internet almost 4 times before it connects fully. All T-Mobile can tell me is disconnect vpn okay does it work now? Like yea now but it’s taken me 4 times. 

jigarmicro wrote:

 

Hello,

I am facing issue with cisco anyconnect vpn and tmobile 5g home internet. without VPN works great with 350+mbps speed. But with VPN, it connect-disconnect every 5 min. I debugged issue with company IT tech and they told me that its Internet provider issue.

I called Tmobile tech and she mentioned that T mobile home internet not work well with VPN as it keep changing IP address. 

 

How it is working for you ? Any suggestion will help me. If i can not resolve this issue then unfortunately have to disconnect tmobile home internet.  Personally I dont want to do that.

I tried below -

1. Cisco any connect support IPv4 so disabled Ipv'6 on t mobile device.
2. created separate network in t mobile app and using that for just my company laptop
3. Cisco any connect enabled “Allow local (LAN) access when using VPN” 

I’m right there with you since thanksgiving of 2022 I had been with T-Mobile internet since Feb 2022 no issues but all of sudden Cisco jabber vpn connects then disconnects every 5 mins I have to restart and unplug internet almost 4 times before it connects fully. All T-Mobile can tell me is disconnect vpn okay does it work now? Like yea now but it’s taken me 4 times. 

Hello,

I am facing issue with cisco anyconnect vpn and tmobile 5g home internet. without VPN works great with 350+mbps speed. But with VPN, it connect-disconnect every 5 min. I debugged issue with company IT tech and they told me that its Internet provider issue.

I called Tmobile tech and she mentioned that T mobile home internet not work well with VPN as it keep changing IP address. 

How it is working for you ? Any suggestion will help me. If i can not resolve this issue then unfortunately have to disconnect tmobile home internet.  Personally I dont want to do that.

I tried below -

1. Cisco any connect support IPv4 so disabled Ipv'6 on t mobile device.
2. created separate network in t mobile app and using that for just my company laptop
3. Cisco any connect enabled “Allow local (LAN) access when using VPN” 

Checking  Allow local (LAN) acccess when using VPN (if configured) worked for me. I also selected the “First_Time_Connect” server (don’t know if that’s a universal option). I’m online now via T-mobile for the first time in two weeks.

Thanks for the reply, very helpful! Appreciate the insight.

To make a long story short if your company support dual stack IPv4 and IPv6 you should be fine. Unfortunately, my case is that they only support IPv4. The solution to my case is to disable my laptop IPv6. However, it does have some side effects. Hence, discuss it with your IT team before you do so. Good luck.

Hmm I am also experiencing issues with Cisco AnnyConnect and my T-Mobile Alcatel hotspot. I tried rebooting factory settings and toggling the Allow local access options -- which worked for a week or so--but I am now seeing the “Unable to contact ___” error. 

I am considering setting up a secondary (travel) router to see if that would fix the issue, but curious if there are other workarounds. Thanks for any insight!

tomwil wrote:

https://community.t-mobile.com/tv-home-internet-7/issue-with-cisco-anyconnect-and-home-5g-43126?postid=160086#post160086

 

My company tech’s told me to check the box in the Cisco AnyConnect Settings     

Check   Allow local (LAN) acccess when using VPN (if configured)  

It now works.

Thanks! Checking the box for that setting seems to have fixed my issue as well!

I have been worked on this issue since 06/06/2022. It looks like the problem is not on the Cisco AnyConnect or T-Mobile but on the IP protocols. Last night I have succussed in fixing “the site is not available” due to the DNS server.  I will get back to this issue after more tests.

My company tech’s told me to check the box in the Cisco AnyConnect Settings     

Check   Allow local (LAN) acccess when using VPN (if configured)  

It now works.