I still have a few users with windows 8/8.1 and I am seeing an issue with their machines after activating the latest GP revisions on my firewalls. After a fair amount of troubleshooting, I found that the PANGP adapter wasn't installed.
Users report that the following error comes up in their client:
"Could not connect to the global protect service"
I uninstalled the latest revisions, and reverted their machines to 5.2.11 and the installation goes smoothly again.
GlobalProtect 6.0 isn't compatible with Windows 8 officially, so unfortunately you aren't going to gain any traction on that one even if you open a support ticket. I would open a ticket on the Windows 8.1 issue however, because that is still officially supported.
Unfortunately I can't provide any additional troubleshooting help. We don't allow unsupported operating systems or Win10/11 builds to connect to any of my GlobalProtect installations, so I haven't had to deal with any Win8/8.1 validations for a couple years at this point.
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