Error: The WebResource.axd handler must be registered in the configuration to process this request.

NB: This might also help if you are seeing strange issues on your Dot Net Nuke install, such as the login link not working.

To solve the error below add the following line to this section of their web.config file:

<add name="WebResource" path="WebResource.axd" verb="GET" type="System.Web.Handlers.AssemblyResourceLoader"/>

In the following location of your web.config file:

<configuration>

     <system.webServer>

           <handlers>

                INSERT IN HERE

           </handlers>

     </system.webServer>

<configuration>

The error typically shows as:

----------------------------------------

Server Error in '/' Application.

The WebResource.axd handler must be registered in the configuration to process this request.

<!-- Web.Config Configuration File -->

<configuration>
   <system.web>
       <httpHandlers>
           <add path="WebResource.axd" verb="GET" type="System.Web.Handlers.AssemblyResourceLoader" validate="True" />
       </httpHandlers>
   </system.web>
</configuration> 

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: The WebResource.axd handler must be registered in the configuration to process this request.