For affected users, the only event we're seeing in the GP log on the firewall is portal-prelogin. I've looked at the pangps.log from an affected client and it wasn't really helpful. We've tried a few different GP versions, including the latest 6.1.0, and full uninstall/reboot/install.
Based on this thread, I'm thinking it might actually be a Windows update issue, but we haven't gotten to testing either uninstalling the October CU or installing the out-of-band patch noted there. Thanks.
Matt
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