Not a solution that would work for most of us, but may help understand what is happening.While other WiFi booster software apps only “help” you share your Internet connection (inherent issues included – NAT levels, peering, Chromecast apps won’t find your Chromecast, your Apple TV won’t show up for your Mac to stream to…), Connectify Hotspot offers you more: The first thread below has an interesting explanation from ATT where UPD port 443 is being used/controlled by ATT and causing VPN traffic to be dropped. A friend at work has replicated it on his laptop using his AT&T phone hotspot and the same VPN. My laptop and VPN have no issues on any other network or ISP, just AT&T. The VPN connection itself usually remains connected. At worst the remote session will work for a few seconds and then disconnect, then repeat over and over. Both work great UNTIL I connect to the Anyconnect VPN, at which point the file transfers, remote desktop, etc become very unstable or completely unresponsive for 10-20 seconds - transfers stop, remote desktop disconnects, etc.

Two different devices, SIM cards, and APNs, yet same exact problem. One device is my cell phone's hotspot feature (iphone 11), and the other is my Netgear LB1120 LTE modem. Problem description: I've been having the same issue for about the past 2-3 weeks and on two separate devices when VPN'ing using Cisco Anyconnect. Would be great if we could get a spotlight on this as it potentially impacts a very large number of users. Many of us rely heavily on VPN access through ATT LTE, and for me personally this has really made work difficult. FYI if this helps there are several recent threads going on about this same problem.

Cisco anyconnect iphone hotspot