Restart application pool

Source: http://www.sharepoint-girl.com/2007/12/restart-application-pool.html

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You can restart a specific Application Pool by using the IIS Manager GUI or using cscript.exe in the command prompt.

Restart Application Pool with IIS Manager:
1) Open IIS Manager.
2) Expand the Server node.
3) Expand the Application Pools folder.
3) Right-click on the application pool that you want to restart and then select Stop.
4) Right-click on the application pool again and then selct Start.

Restart Application Pool with cscript.exe in Command Prompt:
1) In the command prompt, type the following command:

cscript.exe c:\windows\system32\iisapp.vbs /a "DefaultAppPool"