DOCUMENT:Q242900  08-MAY-2002  [exchange]
TITLE   :XWEB: HTTP/1.0 Server Error Message When You Attach Files in OWA
PRODUCT :Microsoft Exchange
PROD/VER::5,5.5
OPER/SYS:
KEYWORDS:

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The information in this article applies to:

 - Microsoft Outlook Web Access, version 5.5 Service Packs 1, 2, 3 
 - Microsoft Internet Explorer version 5 for Windows 95 
 - Microsoft Internet Explorer version 5 for Windows 98 
 - Microsoft Internet Explorer version 5 for Windows NT 4.0 
 - Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

When you attempt to attach a file to a new message in Outlook Web Access (OWA),
you may receive the following error message:

   HTTP/1.0 500 Server Error (A dynamic link library (DLL) initialization
   routine failed.)

The only option available is to close the dialog box, which cancels the message
you are attempting to send.

After this occurs, the following error appears in the application event log on
the Exchange Server computer:

   Event ID: 19
   Source W3SVC
   Type: Error
   Category: None
   Description: The HTTP server was unable to load the ISAPI application
   'c:\exchsrvr\webdata\exupload.dll'. The data is the error.

CAUSE
=====

This error is caused by registry restrictions that prevent guest access; it
occurs when OWA is using Internet Explorer 5. This error occurs if the following
registry key is enabled with a value of 1:

   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Eventlog\Application\RestrictGuestAccess

This registry key prevents guests or anonymous users from viewing event logs on
the server.

RESOLUTION
==========

A supported fix is now available from Microsoft, but it is only intended to
correct the problem described in this article and should be applied only to
systems experiencing this specific problem. This fix may receive additional
testing at a later time, to further ensure product quality. Therefore, if you
are not severely affected by this problem, Microsoft recommends that you wait
for the next Internet Explorer 5 service pack that contains this fix.

To resolve this problem immediately, 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, please go to the following
address on the World Wide Web:

   http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal 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 should have the following file attributes or
later:

   Date       Time       Version         Size     File name    Platform
   --------------------------------------------------------------------
   6/18/1999  7:08:33PM  5.00.2614.3300  459,024  Wininet.dll  x86



STATUS
======

Microsoft has confirmed this to be a problem in the Microsoft products that are
listed at the beginning of this article.

MORE INFORMATION
================

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

   Q235513 Internet Explorer 5 Cannot Attach File into OWA Message

Additional query words:

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Keywords          :  
Technology        : kbOutlookSearch kbIEsearch kbExchangeSearch kbExchange550 kbZNotKeyword2 kbOWASearch kbIENT400Search kbIE95Search kbIE500Search kbZNotKeyword3 kbIE98Search kbOWA550SP1 kbOWA550SP2 kbOWA550SP3 kbIE500Win95 kbIE500Win98 kbIE500WinNT400
Version           : :5,5.5
Issue type        : kbbug
Solution Type     : kbfix

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Copyright Microsoft Corporation 2002.