Cannot instanciate .Net COM object in classic ASP/

Question

I've written a COM interop enabled class-library in C# using .Net 3.5. The object is meant to provide some utility functions for classic ASP pages. I've written a test.asp page which instanciates the desired object and calls its methods. Works fine on my machine.

On a different machine (Windows Server 2003 - Standard Edition) it doesn't work eventhough the assembly is registered with regasm correctly. I've checked the regedit and afaik it looks ok.

The error I'm getting is "ASP 0177" (error code), "8000ffff; Server.CreateObject-Fehler" (error description) which translates to Server.CreateObject-Error.

Btw. the assembly is signed and doesn't have any other custom build assemblies as dependencies (just the system stuff).

Did anyone experience something similar?

Answer 1

I think it's a security issue. It seems you had developed and tested the component in your own pc, which have a lot of differences compared to a server (having visual studio installed by example).

---

EDIT: Please take a look at this Microsoft "Hotfixes a hotfix":

• Error message when you browse a Web server that has Internet Explorer 7 installed: "ASP 0177:8000ffff"
• KB937143 breaks ASP to .NET COM interop

Answer 2

Granting the IUSR user (or whoever your IIS user is) read-access to the following Registry Key did the job for me and fixed the Problem.

HKEY_USERS\S-1-5-20\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones

Answer 3

• Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN\ FeatureControl\FEATURE_IGNORE_ZONES_INITIALIZATION_FAILURE_KB945701
• Note If the FEATURE_IGNORE_ZONES_INITIALIZATION_FAILURE_KB945701 subkey does not exist, you must manually create it. If you're using a 64 bit OS, you may need to use HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\MAIN\ FeatureControl\FEATURE_IGNORE_ZONES_INITIALIZATION_FAILURE_KB945701 instead
• Right-click FEATURE_IGNORE_ZONES_INITIALIZATION_FAILURE_KB945701, point to New, and then click DWORD Value
• Type w3wp.exe to name the new registry entry, and then press ENTER.
• Right-click w3wp.exe, and then click Modify.
• In the Value data box, type 1, and then click OK.

After setting this registry key, a simple app pool restart will apply the change. No longer will your .NET COM components randomly stop working with no real solution except shuffling application pools!