Environment: Exchange 2007 Sp3 single server with all roles. Outlook Anywhere, ActiveSync, EWS, and OWA are published using ISA 2006. ISA 2006 is a single NIC setup and is only functioning as a reverse proxy for Exchange and SharePoint.
Issue:
Outlook anywhere has stopped working in my environment. Not sure when, but I found this out today.
Basically, when I open Outlook outside of my network, I am prompted for credentials and after entering my credentials Outlook hangs for a short while and then dispays "Microsoft Exchange is Unavailable - retry, work offline or cancel". On the ISA server side I see several "Failed Connection Attempts - (LDAP) username RPC_IN_DATA http://email.domain.com/rpc/rpcproxy.dll?internalemailserver.local:6004
The RPC_IN_DATA URL also has another failed entry with a different internal server name for one of my AD servers EXamplehttp://email.domain.com/rpc/rpcproxy.dll?internalADserver.local:6004
In addition there is an "Allowed Connection" entry for RPC_OUT_DATA forhttp://email.domain.com/rpc/rpcproxy.dll?internalADserver.local:6004
If I open the url: https://email.domain.com/rpc/rpcproxy.dll I receive the ISA logon page. After logging on I receive the following:
Technical Information (for support personnel)
- Error Code 64: Host not available
- Background: The connection to the Web server was lost.
I am really at a loss here. As I stated I am not entirely sure when this issue occurred. I recently published EWS through ISA by adding the path /EWS/* to the Outlook Anywhere rule. I did create an EWS external URL on the Exchange server. Other than this I am not aware of any other changes.
Can you please offer assistance.