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I just got a new machine, its 64 bit however I still have an application that was written in a 32 bit environment using .net 2.0. I made some changes to the code and tried to debug and I get:

HTTP Error 500.0 - Internal Server Error
Calling LoadLibraryEx on ISAPI filter

"C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_filter.dll" failed"

So I googled for the life of me and it tells me to reregister IIS. I do that several times but to no avail. I also checked the app pool for this app and it was set to use the wrong .net version (4.0). So I changed it to use 2.0. Restarted IIS tried to run the app same error message.

If I go into IIS management right click the site name select "Manage Application"->"Advanced Settings..." I have the screen shot here:

enter image description here

If I click on the application pool section it says this:

enter image description here

So I am not sure what I am doing wrong...I look inside c:\windows\microsoft.net and I have the 2 folders "Framework" and "Framework64" I assume the prior is for 32 bit:

enter image description here

Finally the last thing I look at is the "ISAPI and CGI Restrictions" within IIS Management. Here is what they are set to:

enter image description here

Again I am running on an AMD64 bit system running windows 7. I have all the various frameworks installed, however this particular app is an asp.net 2.0 application. Any help is appreciated...

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closed as off topic by MDMarra, mailq, Ward, Shane Madden, Iain Dec 7 '11 at 21:05

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Why was this closed as off topic? What is so off topic about it? –  JonH Jun 14 '12 at 15:09

1 Answer 1

up vote 1 down vote accepted

Wow I got it working thanks to this: http://www.codertakeout.com/v/35674/4O9BY I had to enable 32 bit apps in the app pool as well as enable the ISAPI CGI Restrictions for the 32 bit version of ASP.net v2.0

All confusing stuff!

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