XADM: Cannot Log On to Exchange 2000 Server Computer by Using the Correct Credentials (326036)


The information in this article applies to:

  • Microsoft Exchange 2000 Server
This article was previously published under Q326036

SYMPTOMS

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.

CAUSE

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.

RESOLUTION

To resolve this problem, make sure that you are trying to make RPC connections through Internet Protocol (IP). To do so, follow these steps:
  1. Remove the ncacn_np item from the RPC_BINDING_ORDER registry value in the following registry key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\Exchange Provider

  2. Make sure that the following registry key contains the information that is listed in one of the following tables, as appropriate to your operating system:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Rpc\ClientProtocols

    The following values are the core required values for Microsoft Windows XP and Windows 2000:

    NameTypeData
    (Default)REG_SZ(value not set)
    ncacn_httpREG_SZRpcrt4.dll
    ncacn_ip_tcpREG_SZRpcrt4.dll
    ncacn_npREG_SZRpcrt4.dll
    ncadg_ip_udpREG_SZRpcrt4.dll

    The following values are the core required values for Microsoft Windows 98:

    NameTypeData
    (Default)REG_SZ(value not set)
    ncacn_npREG_SZRpcltc1.dll
    ncalrpcREG_SZ
    ncadg_ip_udpREG_SZRpcltc3.dll
    ncacn_httpREG_SZRpcltccm.dll

    The following values are the core required values for Microsoft Windows NT 4.0:

    NameTypeData
    (Default)REG_SZ(value not set)
    ncacn_npREG_SZRpcltc1.dll
    ncalrpcREG_SZ
    ncadg_ip_udpREG_SZRpcLtCcm.dll
    ncadg_ip_udpREG_SZRpcLtCcm.dll
    ncacn_nb_tcpREG_SZRpcLtCcm.dll
    ncacn_httpREG_SZRpcLtCcm.dll

MORE INFORMATION

For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

163576 XGEN: Changing the RPC Binding Order

Modification Type:MajorLast Reviewed:8/19/2003
Keywords:kbprb KB326036 kbAudEndUser kbAudITPRO
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