XWEB: Web Client Fails With NTLM If Client for MS Networks Not Installed (167752)
The information in this article applies to:
- Microsoft Outlook Web Access 5.5
- Microsoft Exchange Active Server Components 5.0
- Microsoft Exchange Server 5.0
- Microsoft Exchange Server 5.5
This article was previously published under Q167752 SYMPTOMS
When you use an Internet browser to connect to a mailbox on an Exchange
Server computer configured for Windows NT Challenge/Response (NTLM)
password authentication, the following error message may appear:
Internet Explorer cannot open the Internet site
http:///logonfrm.asp?mailbox=
An unexpected error has occurred. Restart Internet explorer and then try
again.
CAUSE
The Microsoft Exchange Windows 95 client and Web client currently require
that the Microsoft Client for Microsoft Networks redirector (Vredir.vxd) be
installed on the Windows 95 client. Because Microsoft Exchange uses
integrated security with the Windows NT Directory Services, the Microsoft
Exchange client needs validation from a Windows NT domain controller. For
NetWare-only environments using Microsoft Exchange Server, this means both
the Microsoft Network redirector and a NetWare redirector must be installed
on a Windows 95 client.
This limitation is a result of the way the NTLM security subsystem was
designed on Windows 95 and is not a limitation of the Microsoft Exchange
Windows 95 client. The Microsoft Exchange Windows 3.x and Microsoft
Exchange Windows NT clients do not have this requirement.
WORKAROUND
An updated NTLM security DLL fixes this problem so that the Microsoft
redirector is no longer needed for the Exchange client to get validated. It
should be placed in the Windows\System subdirectory. This updated DLL is
found in the Windows 95 DCOM update on:
| Modification Type: | Minor | Last Reviewed: | 4/28/2005 |
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| Keywords: | kbusage KB167752 |
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