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OL Client can't logon to Exchange server

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5 replies

by ramborabbit

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I have one client on my network that cannot connect to the exchange server. The client station is WinXP.SP1 and is authenticated to the domain. When Outlook XP is launched, the system prompts for the user id (the client is set to use password authentication). The user keys the password and the system responds that the logon information is incorrect, check the username, password or domain. This occurs on any user id entered, including the administrator. I have not found anything that can help me resolve this problem. The user can connect using OWA.

5 replies

by a.grogan

I have seen this a few times on my network, one of two things normally fixes this:

1) Totally remove the e-mail profile on the machine and reboot, then set it up again.

2) Remove Outlook XP and reboot, then re-install.

Hope that this helps.

by ramborabbit

I have done the uninstall/reboot/reinstall and it does not work. I will remove the profile and retry.

by tpcosmo

Does the XP Pro client connect to the exchange server when logged in as a a user with admin. rights on the network.

I had the same problem with newly deployed XP boxes. I bet this is your fix: The xp box probably isnt using TCP/IP to communicate with the exchange server. Admins are allowed to talk to exchange via UDP, and thats why it works as an admin.
You can confirm this be checking the registry:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\RPC\Client Protocols.
See if you have keys installed. I bet you dont. That location should have:
Name Type Data
ncacn_http Reg_SZ rpcrt4.dll
ncacn_ip_tcp Reg_SZ rpcrt4.dll
ncacn_np Reg_SZ rpcrt4.dll
ncacn_ip_udp Reg_SZ rpcrt4.dll

Add those values, and I bet it works just fine.

by ramborabbit

Poster rated this answer.
I am using TCP/IP only on my network. The client was working fine , but stopped working.

I was able to fix things by restarting the server. Go figure.

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