This article was previously published under Q326036
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If you use Microsoft Outlook to connect to an Exchange 2000 server, you are prompted to provide a user name, a password, and a domain name. After you enter this information, Outlook repeatedly prompts you to provide your credentials, and you cannot connect.
Note You are not a member of the Administrators group or the Domain Admins group, but this problem is resolved if you are added to the Domain Admins group.
The computer that is running Outlook is trying to make a remote procedure call (RPC) connection through named pipes. Exchange 2000 permits users to make RPC connections through named pipes. However, you cannot connect to the Exchange 2000 server by using RPC through named pipes if you are not a member of the Domain Admins group.
To resolve this problem, make sure that you are trying to make RPC connections through Internet Protocol (IP). To do so, follow these steps:
Remove the ncacn_np item from the RPC_BINDING_ORDER registry value in the following registry key: