Web sites and Web applications depend on the availability of Internet Information Services (IIS) application pools. IIS application pools in turn depend on the Windows Process Activation Service (WAS). If WAS is not running or errors occur during the startup or shutdown of an application pool, Web sites and Web applications may not be available..
Stop and restart the application pool
Application pools occasionally need to be restarted in order to return to normal operation. Because application pools depend on the Windows Process Activation Service (WAS), you may have to restart WAS. If you restart WAS, you may also have to restart the World Wide Web Publishing Service (W3SVC), which depends on WAS.
Stop and start the application pool
To stop and start the application pool:
Click Start, click Control Panel, and then click Administrative Tools.
Right-click Internet Information Services (IIS) Manager and select Run as administrator.
In the Connections pane, expand the server node and select Application Pools.
In Features View, select the application pool you want to start or stop.
In the Actions pane, do one of the following:
Click Stop to stop the application pool.
Click Start to start the application pool.
Stop and start WAS
To stop and start WAS:
Open an elevated Command Prompt window. Click Start, point to All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
From the command prompt, type net stop was.
From the command prompt, type net start was.
Start the W3SVC
To start the W3SVC:
From the command prompt, type net start w3svc.