I recently migrated my Exchange 2007 to 2013. All computer were able to connect to new server automatically except one which was using Windows 8.1 1home. I upgraded the computer to pro and joined doman and it still fails to connect to both OWA and from outlook client. I tried to added host name and IP address to hosts file and still does not work, In fact, when I double click on OWA certificate error it is actually giving error on watchguard fireall certificate instead of showing actual exchange certificate.
I have already disabled window firewall. Why only one computer is unable to fetch correct exchange certificate?