Article ID: 193310
Article Last Modified on 3/5/2007
APPLIES TO
- Microsoft ActiveX Data Objects 2.0
- Microsoft Internet Information Server 3.0
This article was previously published under Q193310
SYMPTOMS
ADO 2.0 and IIS 3.0 have an internal conflict due to the way both products handle proxies. Subsequently, when you install ADO 2.0 on a computer with IIS 3.0, an error message similar to the following might appear:
This error is actually the result of an access violation in the ASP.dll. However, this could happen with any product that wraps automation objects the same way that IIS 3.0 does.
CAUSE
At a high level, this problem is caused by a combination of IIS 3.0 wrapping automation objects within its own object and ADO 2.0 not having bullet-proof support when it is used through proxy.
ADO passes an interface to ASP, which is wrapped within an automation object. Later, when ADO requests the object back it receives a private interface which references the ASP wrapper of the ADO interface, not the actual ADO Interface itself. ADO assumes that the interface passed back must be a legitimate ADO object because it is a private interface. ADO tries to call a method by casting the interface to an ADO object, which fails.
RESOLUTION
To resolve this problem, download the Microsoft Data Access Components 2.0 Service Pack 1 from the following Web site:
Please note that the MDAC 2.0 Service Pack 1 is available as a component of the Windows NT 4 Service Pack 4 download but still can be downloaded and installed as a separate file without installing Windows NT 4 Service Pack 4.
The fix comes in a self-extracting file. When you extract the files from the fix, they should have the following time stamp and version information:
Filename Version Size Date ------------------------------------------------- msader15.dll 2.0.3002.23 6,656 09-16-1998 msado15.dll 2.0.3002.23 328,464 09-16-1998 msadocg.dll 2.0.3002.23 102,400 09-16-1998 msador15.dll 2.0.3002.23 37,888 09-16-1998 msadrh15.dll 2.0.3002.23 40,720 09-16-1998
Installation instructions
- Extract the hotfix files in a new directory.
- Locate the msado15.dll on your computer.
- Copy the new DLL's that were created when you unzipped the fix to the location of the msado15.dll. Be sure that there is only one version of the msado15.dll on your computer. It is usually installed in the C:\Program Files\Common Files\System\ado directory.
Register the DLLs using RegSvr32.exe (provided with the patch):
regsvr32 <dll name.dll>
You need to register MSADOCG.dll, MSADOR15.dll, and MSADRH15.dll.
- Restart your computer.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. The problem has been fixed in the Microsoft Data Access Components 2.0 Service Pack 1 (MDAC Version 2.02), which can be downloaded from www.microsoft.com/data/.
Additional query words: ado mdac dasdk iis internet information server
Keywords: kbhotfixserver kbqfe kbbug kbdatabase kbfix KB193310