application pool disabled due to worker process failure

Posted by Unknown
Cause:
This issue may occur if the NT AUTHORITY\NETWORK SERVICE account does not have the permissions to the required registry keys.

Resolution:
To resolve this issue, set the permissions to the required registry keys, and then restart IIS 6.0. To do this, follow these steps:
  1. Identify any required registry keys that do not have sufficient permissions. To do this, you can use a tool such as Sysinternals Regmon. For more information about Regmon, visit the following Sysinternals Web site:
    http://technet.microsoft.com/en-us/sysinternals/default.aspx
  2. Click Start, click Run, type regedit, and then click OK.
  3. Set the permissions to each registry key that you identified in step 1. To do this, follow these steps for each registry key:
    1. Right-click the registry key, and then click Permissions.
    2. Click Add, type NETWORK SERVICE, and then click OK.
    3. Click NETWORK SERVICE, click to select the Full Control check box, and then click OK.
  4. Quit Registry Editor.
  5. Click Start, click Run, type %SystemRoot%\system32\inetsrv\iis.msc, and then click OK.
  6. Right-click the server that is running IIS 6.0, click All Tasks, and then click Restart IIS.
Solution:
To avoid this problem going forward we need to set rapid fail protection settings in IIS.
select the application pool and select your site name then goto properties.
There we can find the option rapid fail protection.
By default it is 5 failures in 5 minutes happens its enabled and gives the service unavailable.
Change the number to the 25 or above.
i hope it will help you....
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