We have a server that has been running for well over a year with no problems. It is a Small Business Server 2003 with Exchange 2003. Everything has been working until today. For some reason RPC over HTTP connections no longer seem to be working. If my clients connect using a VPN client everything works fine. I thought it might be a password issue or an Outlook profile issue, but I have eliminated these as causes by resetting the password and creating a new profile. The issue persists. I have looked in the event logs and do not see anything that indicated specific issues with RPC or Exchange.
I do however see the following error in the event logs:
Reason: Unknown user name or bad password
User Name: username
Logon Type: 3
Logon Process: IAS
Authentication Package: MICROSOFT_AUTHENTICATION_P
Caller User Name: SERVERNAME$
Caller Domain: DOMAIN
Caller Logon ID: (0x0,0x3E7)
Caller Process ID: 988
Transited Services: -
Source Network Address: -
Source Port: -
In addition there is the following event that is showing up. It shows to be there every day so I am not sure that it is related.
RPC Proxy successfully loaded in Internet Information Services (IIS) mode 6.0.
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp
All Exchange services seem to be working fine. I can connect to OWA and if I establish a VPN connection first, Outlook works fine as well.
In the Exchange Server Connection Status box both mail and directory show to be connected when I am using the VPN. However, if the VPN is not connected they show offline or disconnected.
When I open Outlook without the VPN I get the login credentials box, but it does not accept the credentials I supply even after I reset the password.