XWEB: HTTP/1.0 Server Error Message When You Attach Files in Outlook Web Access (242900)


The information in this article applies to:

  • Microsoft Internet Explorer 5.0 for Windows NT 4.0
  • Microsoft Internet Explorer 5.0 for Windows 98
  • Microsoft Internet Explorer 5.0 for Windows 95
  • Microsoft Outlook Web Access 5.5 SP 1
  • Microsoft Outlook Web Access 5.5 SP 2
  • Microsoft Outlook Web Access 5.5 SP 3
  • Microsoft Exchange Server 5.5
This article was previously published under Q242900

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 that is described in this article. Apply it only to computers that are experiencing this specific problem. This fix may receive additional testing. 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 hotfix.

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, visit the following Microsoft Web site:

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

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 typical 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 that this is 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:

235513 Internet Explorer 5 Cannot Attach File into OWA Message

Modification Type:MinorLast Reviewed:10/7/2005
Keywords:kbbug kbfix kbQFE KB242900
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