404.2 The page you are requesting cannot be served because of the ISAPI and CGI Restriction list settings on the Web server,Solve HTTP Error 503. The service is unavailable in IIS,Steps to solve HTTP Error 503. The service is unavailable are as follows:,How to install aspnet_regiis in your system

Internet Information System(IIS) Related Issues:

1.The page you are requesting cannot be served because of the ISAPI and CGI Restriction list settings on the Web server.

   Solution:-       Step 1: Open IIS and click the server name

                        Step 2. Double click “ISAPI and CGI Restrictions”

                        Step 3. Right click ASP.NET v4.0.30319 and select “allow”

                        Solve  the error and work fine.

2. Stopping and Starting the World Wide Web Publishing Service

    Solution:-      Step 1:     Go to Start > All Programs > Administrative Tools > Services.

                            In the services list, right-click World Wide Web Publishing Service,                                 and then   click Stop (to stop the service), Start (to start it after it has                             been stopped), or Restart (to restart the service when it is running).

3.Solve HTTP Error 503. The service is unavailable in IIS

    Solution:   Above error  is caused if application pool is paused or disabled.

                           Step 1:Open IIS and look for the  application pool of the selected website. here in this                                        example the website name is test.

                            Step 2:Select the Application Pool.

                            Step 3:Write click on the website name in the Application Pool and then click  on                                                 Start .

                            Step 4:Browse the website and the error would be resolved.

4.HTTP Error 500.21 - Internal Server Error  Handler "PageHandlerFactory-Integrated" has a bad module "ManagedPipelineHandler" in its module list

   Solution:

           Step 1: login administrative(command prompt)

 c:\Windows\Microsoft.NET\Framework\v4.0.21006\aspnet_regiis.exe/i

  start iis start page and browse