All PC's in one office stopped connecting to hosted Exchange on Monday 18th. We believe we have eliminated the hosting provider, the ISP, and the local network/firewall, leaving the physical pc's as suspect. All PC's are Windows 7 Pro with Office 2010 Pro. (M3 is the customer.)
The problem manifests as "Loading Profile" and goes no further. When setting up a new Outlook profile, 'an encrypted connection could not be established...", then try un-encrypted, no help, manual settings do not work either.
This is a workgroup environment, so no group policy in play.
My laptop with hosted Exchange (different provider) connects fine on M3’s network.
A new Windows profile and new Outlook profile is not successful on any of M3’s pc’s on M3’s network.
Charter changed the IP block for M3 Resources. New static address (block of 5 statics) No help.
Created a new Windows profile and new Outlook profile on a pc iat a remote location on a Windstream network and successfully connected.
Created a new Windows profile and new Outlook profile on my laptop on M3’s network and successfully connected.
These actions seem to eliminate the Exchange provider, Charter, and the local M3 network, leaving the pc’s as suspect.
Malware/rootkit scans reveal nothing.
Uninstall/reinstall Office, to a new Windows profile, no help.
Autodiscover passes the test at https://testconnectivity.microsoft.com/
Any help/guidance much appreciated as we are stumped. Our next step is to restore a pc backup prior to patch Tuesday, then maybe look at reimaging the entire environment.