SYMPTOMS
If Internet Explorer is configured with the
Use
HTTP 1.1 through proxy connections setting and NTLM authentication is
configured on both the Web proxy (such as Microsoft Internet Security and
Acceleration Server 2000) and the Web server (such as Microsoft Internet
Information Services), Internet Explorer does not authenticate with the Web
server and you receive the following error message:
You
are not authorized to view this page
401.1 Unauthorized logon failed
RESOLUTION
A
supported fix is now available from Microsoft, but it is only intended to
correct the problem that is described in this article. Apply it only to
computers that are experiencing this specific problem.
To resolve this
problem, contact Microsoft Product Support Services to obtain the fix. For a
complete list of Microsoft Product Support Services phone numbers and
information about support costs, visit the following Microsoft Web site:
NOTE: In special cases, charges that are ordinarily incurred for
support calls may be canceled if a Microsoft Support Professional determines
that a specific update will resolve your problem. The usual support costs will
apply to additional support questions and issues that do not qualify for the
specific update in question.
The English version of
this fix has the file attributes (or later) that are listed in the following
tables. The dates and times for these files are listed in coordinated universal
time (UTC). When you view the file information, it is converted to local time.
To find the difference between UTC and local time, use the
Time Zone tab in the
Date and Time tool in
Control Panel.
The English version of this fix for Internet Explorer
5.5 Service Pack (SP) 2 should have the following file attributes or later:
Date Time Version Size File name
-------------------------------------------------------
07-Jun-2002 15:11 5.50.4918.700 481,552 Wininet.dll
The English version of this fix for Internet Explorer 6 should
have the following file attributes or later:
Date Time Version Size File name
-------------------------------------------------------
07-Jun-2002 15:07 6.00.2718.700 583,168 Wininet.dll
The English version of this fix for Internet Explorer 6 SP1 should
have the following file attributes or later:
Date Time Version Size File name
-------------------------------------------------------
23-Oct-2002 14:30 6.0.2800.1130 585,728 Wininet.dll
Note that you must correctly configure
the HTTP Keep Alive feature to use NTLM authentication.