Is anyone else using a Sophos XG firewall and suddenly having issues with user authentication webpage appearing at regular intervals? Seems to be since the latest Windows 10 / 11 updates on Tuesday 14th June.
Normally domain PCs authenticate to the firewall using STAS, so they shouldn't ever see the login page unless the firewall is restarted. There is a Sophos certificate deployed to all domain PCs through AD to allow HTTPS decryption, but we have had to disable this and also the match known users settings to allow people to access the internet without the user authentication page re-appearing every 20-30 minutes.