Corporate VPN issues using hotspot

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Hello,

We are having this issue recently. We have 792 unite 2 hotspot that will not allow cisco anyconnect vpn to connect, says connected then drops 5 seconds or so later.

Di you have a resolution to this?

Unfortunately no. This is clearly an att issue as I connect fine on every other WiFi network. Att, is there an actual phone number I can call for technical support to debug?

I'm having this same issue. Cisco Anyconnect (our vpn) reconnects every 8 seconds or so. My IT stated it is the fault of ATT. They recommend switching carriers. Is there anything ATT can do so that I won't  have to switch?

I am having the same issue in Perry, GA. Is there a solution for this?

This link did not appear to contain a solution. I am having the same problem and still trying to figure it out

You'll need to modify the MTU settings.  I set mine to 1320 and that appeared to do the trick.  See reply #15 for the commands you'll need to run  in windows.  If you're using MacOS or Linux, you may have to google how to change your MTU settings.

https://forums.att.com/t5/AT-T-Internet-Features/ATT-LTE-hotspot-periodically-keeps-disconnection-laptop-VPN/m-p/5951338#M33104

I am having this same issue with an At&t hotspot and Cisco AnyConnect. It only happens with an At&t hotspot, works fine with Verizon and Sprint. I have tried multiple At&t hotspots with the same results. The started happening to me around August. Actually, I can install the Cisco AnyConnect VPN Android app, and when I establish a connection to my Company's VPN, the phone will not pass any traffic - but if the phone is on Wi-Fi, it works flawlessly. This is only happening when using At&t's mobile network. This is absolutely an At&t problem that they need to address.

I tried the MTU setting change and it has done nothing for me.

Also having the same issue from my phone's hotspot and from my home internet (also AT&T LTE-based) to my company's VPN (Cisco Anyconnect).  Worked for years until about two weeks ago.  I can connect to the VPN no problem and then use the connection for a minute or so, but then then transfer rates periodically drop to zero.  On some occasions the VPN will also disconnect.  This makes remote desktop nearly unusable, but the issue occurs with any VPN traffic.  When VPN is off, I have excellent, sustained transfer rates and good ping times.  I have another personal, paid VPN service (similar to Nord VPN) that works fine.  A friend at work has confirmed this on a similar company laptop configuration with his AT&T hotspot on the same corporate VPN.

Unfortunately changing the MTU did not work for me (instructions in post #9 above).  It appears Anyconnect automatically updates the MTU, so when I would reduce the MTU, Anyconnect would automatically pick a lower value than what I set.  Or could this still be an issue?  I'm no expert at this.

Another thread pasted below shows the same issue being resolved by changing the VPN UDP port from 443 to 1194, since apparently AT&T uses 443 for their UVerse service causing conflicts.  See post #s 4 & 7.  But I doubt my IT dept will entertain this.

https://forums.att.com/t5/AT-T-Internet-Equipment/OpenVPN-connection-to-port-443-is-being-dropped-by-network-Is/td-p/5862001