Is there a way to configure Exchange to not require machine account validation when attaching via MAPI RPC?
If you are connecting to a mailbox on an Exchange 5.5 or Exchange 2000 server make sure that the Network Security option on the Security property tab is configured to allow NTLM (NT LAN Manager Authentication) in some way. If it is set to Kerberos only, then that could explain why you keep getting an error too. That is because Exchange 5.5 and even Exchange 2000 servers require NTLM authentication. Only Exchange 2003 supports Kerberos only.
Do you have comments on this Ask the Expert question and response? Let us know.
Dig Deeper on Legacy Exchange Server versions
Related Q&A from Richard Luckett
Some folders in a mailbox on Exchange Server 2013 are not showing up on the folder list in the OWA virtual directory but do appear in other views. Continue Reading
We have a Client Access Server and Mailbox Server on Exchange 2013 and we want to install an Edge Transport role on another machine. I joined the ... Continue Reading
How can I enable Outlook Anywhere to allow internal use for all users and external use for only some users in Exchange 2013? Continue Reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.