In an attempt to ready our Exchange 2003 on-prem server for a migration to the O365 Exchange Online hosted email, I was using the MRCA website to perform a Microsoft Exchange ActiveSync Connectivity Test.
I get green ticks for all items up to authentication.
There was a suggestion that I needed to enable Integrated Windows Authentication for the Microsoft-Server-ActiveSync Exchange Virtual Server...
The ability to do this was greyed out, so I had to install a Hotfix 937071 and I could then make the change.
I did this, and then enabled Integrated Windows Authentication and did a restart on the IIS services.
Now I'm getting calls from staff who use their email account on a smartphone (mainly iPhones at this point) and they report they are being prompted for a password. If they input their correct password, it just reappears over and over.
So I tested this on my iPhone and couldn't complete the account creation with a "Unable to verify account" error.
I followed the exact procedure we've always had for our Exchange accounts on iPhones and cannot get the email working.
So - enter "WTF have I done mode", and I have now reverted the authentication settings (for all Exchange Virtual Servers listed) back to what I think they were before I started, have uninstalled the hotfix and done a full IISadmin service restart (and all the dependent services as well).
This has not fixed the problem.
What can I do to try and restore activesync connectivity (in particular, our phones)???