Hi All,
I have noticed on many, if not all of the Windows 8 machines I've set up that when using a PPTP VPN connection Outlook cannot connect to the exchange server (Using Office 365) and that when accessing OWA through portal, it too does not work.
I initially thought I somehow fixed the issue by turning off the windows firewall, restarting the computer, turning on the windows firewall, and finally restarting again had fixed the problem. It would work after doing this but a few days later the problem came back.
Using Cisco's IPSEC VPN client I do not have this problem.
I have also tried changing the MTU size on the PPTP VPN adapter from 1300 to 1400 and nothing changed. I plan on trying to up it to 1492 or possibly 1500 to see what affect it has on it, but have not had the time to try this yet.
Ideas anyone? I should also note the machines I have tested this on are fully up to date in terms of drivers, BIOS, and windows updates. I've even been able to reproduce the problem using virtual machines using VMWare.
Thanks in advance for any help!