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.
    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