exRCA returned an error:
RPC Proxy can't be pinged.
To make the long story short, the authentication method for Outlook Anywhere has to be set to NTLM on both Ex2013 and Ex2007. Again, just like the previously mentioned ActiveSync and OWA virtual directory issues, I had to reconfigure Outlook Anywhere.
- Disable Outlook Anywhere (http://technet.microsoft.com/en-us/library/bb124537(v=exchg.80).aspx)
- Enable Outlook Anywhere - only performing the step under "To use the Exchange Management Console to enable Outlook Anywhere" (http://technet.microsoft.com/en-us/library/bb123889(v=exchg.80).aspx)
Event Type: Information
Event Source: MSExchange RPC Over HTTP Autoconfig
Event Category: General
Event ID: 3003
Time: 10:50:51 AM
The Outlook Anywhere authentication settings have been updated.
Old settings: Ntlm
New settings: Basic
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
This article provides an extremely friendly insight that I could not find elsewhere:
The parts that struck me was:
- Note the two different authentication settings that are listed. ClientAuthenticationMethod and IISAuthenticationMethods. For the detail oriented people out there, you saw that one was plural and the other singular.
- Client authentication, which is used to allow clients like Outlook 2013 to authenticate with Exchange is properly configured. The same consistent OA client authentication scheme should be deployed on legacy CAS and CAS 2013.
- Internet Information Services (IIS) authentication, which is used to allow Exchange servers to communicate MUST include NTLM auth.
Set-OutlookAnywhere -Identity 'ExchangeServer\Rpc (Default Web Site)' -ClientAuthenticationMethod Basic -SSLOffloading $False –ExternalHostName http://webmail.company.com -IISAuthenticationMethods NTLM, Basic