IIS API Filter Loading Issue - Service Unavailable

Is your IIS Api filter not loading on IIS 6, or loads but shows a red down arrow. When you try to browse any webpage, it show service unavialable. Firstly you should check for application event in event viewer. you must have an entry of error in that. Open that entry and check for the bytes in data section. Here are few possible and known entries

• Data: 02 00 00 00
• Data: 05 00 00 00
• Data: 7E 00 00 00
• Data: 7F 00 00 00

Now for all the above issues please visit - http://blogs.msdn.com/david.wang/archive/2005/06/21/HOWTO-Diagnose-and-Fix-Common-ISAPI-Filter-Installation-Failures.aspx, you will find this blog entry very informative.

But I had a issue which was strange and no way related to any of the above. b1 36 00 00

The filter wont even call GetFilterVersion function. Directly coming to the point here, the machine on which i was running the filter didn't had VC++ runtime libraries. So the filter wasn't loading. Now there might be issues with Debug mode and Release mode filter dll's as well. So its good for you to build a set up project for the filter with correct prerequisites selected. I did that and now my filter running is fine and healty.

For any more queries please leave a comment and i will try to response ASAP.

Happy Coding