ASP.Net AJAX Toolkit and 'AjaxControlToolkit' is undefined

Posted on Thursday, September 3, 2009 by Nicki

If your site uses AJAX, and you receive the dreaded 'AjaxControlToolkit' is undefined error, this might help you.

After some troubleshooting with Fiddler, I found out that I installed the FlatCompress ISAPI filter a while ago to test HTTP compression. It turns out this causes some problems with the ASP.Net AJAX toolkit. After I disabled it and restarted IIS, the error went away. Great. Now I can continue testing BugNET...

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