Today, I was deploying a website for one of my clients that used a lot of AJAX features and was built using .Net Version4.0. The site deployed fine but when trying to perform a AJAX feature, it failed. After looking through the error in Firebug, got the below error:
Ajax client-side framework failed to load in IIS7 using ASP.Net 4.0
After doing a lot of research, I was able to resolve the issue by adding the following to the web.config file under handlers section.
<add modules="IsapiModule" name="AXD-ISAPI-4.0-64" path="*.axd" precondition="classicMode,runtimeVersionv4.0,bitness64" resourcetype="Unspecified" scriptprocessor="C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" verb="*">
<add modules="IsapiModule" name="AXD-ISAPI-4.0" path="*.axd" precondition="classicMode,runtimeVersionv4.0,bitness32" resourcetype="Unspecified" scriptprocessor="C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_isapi.dll" verb="*"></add>
</add>
Now, the section looks as below:
<handlers>
<add modules="IsapiModule" name="AXD-ISAPI-4.0-64" path="*.axd" precondition="classicMode,runtimeVersionv4.0,bitness64" resourcetype="Unspecified" scriptprocessor="C:\Windows\Microsoft.NET\Framework64\v4.0.30319\aspnet_isapi.dll" verb="*">
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