Multiple Remote Employees w/ AT&T Suddenly Having VPN Issues

VPN
1

Title says it all. We have a few remote employees with AT&T and the router they supply. As of last week, these employees can not access the GlobalProtect portal on their home networks. Our remote assistance tool (Remote Utilities) is also blocked. Teamviewer was the only thing that worked.

Things I’ve tried:
Disabling IPV6 (saw on a forum somewhere that this was an issue)
Creating app/port exemptions AND enabling DMZPlus mode for the company laptop on the router’s firewall (I rolled these changes back after it did not work)
Setting Remote Utilities’ port to match Teamviewer’s

Update: It was DNS… AT&T’s DNS servers didn’t recognize our domain, but worked otherwise. Changed the network adapters to use Google/Cloudflare DNS and that resolved our problems.

2

Sounds like ATT. But they will swear nothing has changed.

Do you have a technically savvy user who can put the ATT device in bridge mode and use a decent home router instead?

also, be aware that some have seen lag time in making changes and those changes actually working.

3

We’ve seen users connecting to AT&T home services have settings in their NIC’s changed. I would inspect their NIC settings and compare to a non-affected user.