HOWTO: Fixing the "500 Extended Server Error" Problem on ISAPI
ID: Q163166
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The information in this article applies to:
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Microsoft Internet Information Server versions 1.0, 2.0, 3.0
SUMMARY
This article explains how to fix the following Microsoft Internet
Information Server (IIS) error:
500 Server Error. Specified Module could not be found
MORE INFORMATION
When a Web browser (such as Internet Explorer 3.0) invokes an ISAPI DLL on
the IIS, the server may display the above error message. The reason for
this error is that one or more DLLs on which the ISAPI DLL directly or
transitively depends is either not installed on the IIS server or the DLLs
are located in a directory that IIS does not search. If this is the case,
IIS sends back to the browser an HTTP status code 500, which the browser
then displays as the above error message instead of the expected output
from the ISAPI DLL.
To fix this situation, copy all the DLLs on which your ISAPI DLL directly
or transitively depends to the System32 directory of the IIS server.
A very common cause for this problem is building an ISAPI DLL using the
ISAPI Wizard in Visual C++, using the share libraries option, and then not
having the Visual C++ and MFC runtime DLLs installed on the IIS server. The
Visual C++ and MFC runtime DLLs typically needed are the following.
For Visual C++ 4.2 Debug:
For Visual C++ 4.2 Release:
For Visual C++ 4.1 Debug:
For Visual C++ 4.1 Release:
To generically determine which DLLs you need to install on your IIS server,
use either the DUMPBIN utility that ships with Visual C++ (use the /imports
option), or the Quick View facility of Windows Explorer (if it is
installed) to view what DLLs your ISAPI DLL depends on. Either program
provides you with a list of dependent DLLs. Remember you may need to repeat
this process for any DLLs listed to determine transitive DLL dependencies.
REFERENCES
For additional information, please see the following article in the
Microsoft Knowledge Base:
Q135338 How To View Exported Functions in a DLL.
(c) Microsoft Corporation 1997, All Rights Reserved.
Contributions by Leon Braginski, Microsoft Corporation
Additional query words:
Keywords : iisapi
Version : winnt:1.0,2.0,3.0
Platform : winnt
Issue type : kbhowto