HTTP 404 Page Not Found in Web Api hosted in IIS 7.5

Question

I have a Web Api application. It works perfectly well when I tested it using the VS 2010 debugging dev server. But I now deployed it to IIS 7.5 and I am getting a HTTP 404 error when trying to access the application.

Here is my web.config

<?xml version="1.0" encoding="utf-8"?> <configuration>   <connectionStrings>     <add name="DefaultConnection" connectionString="Data Source=.\SQLEXPRESS;Initial Catalog=aspnet-FlowGearProxy-20123141219;Integrated Security=True" providerName="System.Data.SqlClient" />   </connectionStrings>   <appSettings>     <add key="webpages:Version" value="2.0.0.0" />     <add key="webpages:Enabled" value="true" />     <add key="PreserveLoginUrl" value="true" />     <add key="ClientValidationEnabled" value="true" />     <add key="UnobtrusiveJavaScriptEnabled" value="true" />   </appSettings>   <system.web>     <compilation debug="true" targetFramework="4.0" />     <authentication mode="Forms">       <forms loginUrl="~/Account/Login" timeout="2880" />     </authentication>     <pages>       <namespaces>         <add namespace="System.Web.Helpers" />         <add namespace="System.Web.Mvc" />         <add namespace="System.Web.Mvc.Ajax" />         <add namespace="System.Web.Mvc.Html" />         <add namespace="System.Web.Routing" />         <add namespace="System.Web.WebPages" />       </namespaces>     </pages>   </system.web>   <system.webServer>     <validation validateIntegratedModeConfiguration="false" />     <modules runAllManagedModulesForAllRequests="true" />   </system.webServer> </configuration> 

Answer 1

I was struggling with this as well. Fortunately, Steve Michelotti documented a solution that worked for me here.

At the end of the day, I enabled all verbs (verb="*") to the ExtensionlessUrlHandler-Integrated-4.0 handler in my web config.

<system.webServer>     <validation validateIntegratedModeConfiguration="false" />     <modules runAllManagedModulesForAllRequests="true" />         <handlers>             <remove name="ExtensionlessUrlHandler-Integrated-4.0" />             <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" resourceType="Unspecified" requireAccess="Script" preCondition="integratedMode,runtimeVersionv4.0" />         </handlers> </system.webServer> 

Others have pointed out that having WebDAV enabled causes issues. Fortunately, I did not run into that issue as well.