Error 403, 403.14, 404 - After deploying ASP.NET MVC website on IIS 7, IIS 7.5

After deploying your ASP.NET MVC website on IIS 7 or IIS 7.5, you might face following errors while browsing your website:

• 403.14 - Forbidden (The Web server is configured to not list the contents of this directory.)
• 404 - Not Found (The resource you are looking for has been removed, had its name changed, or is temporarily unavailable)

Following are the possible causes/ fixes for this -

• Make sure the Application pool targets correct version of .NET framework (i.e .NET Framework v4.0.30319 for .NET 4 and 4.5)
• Make sure the Pipeline mode of IIS Application pool is "Integrated"
• Check UrlRoutingModule-4.0 is added in the modules of that website.
• (To do that, open list of added modules by clicking "Modules" against your website, and see if the module "UrlRoutingModule-4.0" is added or not). If not, then add a module by clicking "Add Managed Module" button, where select System.Web.Routing.UrlRoutingModule as a Module type, and give "UrlRoutingModule-4.0" as its name)
• Make sure you have following element added in system.webServer section of website's web.config

<system.webServer>

<modules runAllManagedModulesForAllRequests="true"></modules> 

</system.webServer>

In most cases of 403.14, or 404 error, above are the possible causes and fixes.