I am getting the following error in the even log of my exchange 2010 HUB/CAS Server:
EVENT ID: 1035
Inbound authentication failed with error LogonDenied for Receive connector Default EXCHSVR. The authentication mechanism is Ntlm. The source IP address of the client who tried to authenticate to Microsoft Exchange is [10.0.5.25].
This IP (10.0.5.25) does need to relay through the server, but I'm not sure how to make it happen. I didn't have a problem with this on exchange 2003, but with exchange 2010 I get the above error. Any assistance would be greatly appreciated. Thanks.