We have received many troubleshooting calls lately from windows 7 users whom cant use their office apps over VPN. Outlook is the main call driver, but I have tested thoroughly and see it happening on all office apps. The problem is the authentication popup. Error says ""We are unable to connect right now. Please check your network and try again later." I escalated this to our network techs and for troubleshooting purposes they have placed an allow any/any rule on the firewall for now. We still have the same error, again only on windows 7 machines, not on windows 10. Any suggestions?
FWIW, I'm having this same problem at the moment on Windows 10, connecting via ExpressVPN. Once Outlook connects (the VPN has to be off for that), switching the VPN on doesn't seem to be a problem, e.g. new mail comes and goes fine.
@Robert Woods, I don't see any replies to you - were you able to resolve this back in the day?