Article ID: 121926, created on Jun 7, 2014, last review on Jun 17, 2016

  • Applies to:
  • Plesk 12.0 for Windows
  • Plesk 11.0 for Windows
  • Plesk 11.5 for Windows


Some sites shows the error: HTTP Error 503. The service is unavailable.

Application pool is down used by this site.

Windows logs -> Application -> Event ID 2276

The worker process failed to initialize correctly and therefore could not be started.

Windows logs -> Plesk -> Event ID 1

The service has not been started. (Exception from HRESULT: 0x80070426)
In Microsoft.Web.Administration module 
Exception type: System.Runtime.InteropServices.COMException
   at Microsoft.Web.Administration.ApplicationPool.Stop()
   at IIS7ApplicationPool.startStop(IIS7ApplicationPool* , Boolean start)
   at IIS7ApplicationPool.stop(IIS7ApplicationPool* )

   at stopPool(PleskControlPanel)(WebServerAdapter::setAppPoolIdentity line 2932)
Execute file name: C:\Program Files (x86)\Parallels\Plesk\admin\bin\websrvmng.exe


Incorrect permissions on 'C:\Windows\System32\inetsrv\config\schema' directory


Assign Read,List,Execute permissions to Users group for 'C:\Windows\System32\inetsrv\config\schema' directory. If it does not fix the issue, follow the steps below to find out and set needed permissions:

  1. Make sure that the problem is with filesystem permissions by using 'Process Monitor' utility.

  2. Run procmon.exe and add the filter Result = "Access Denied"

  3. Restart application pools and access to Plesk website https://localhost:8443

  4. Stop capturing and you may see the result as on the picture:


  5. Set required permissions to this directory 'C:\Windows\System32\inetsrv\config\schema'

Others possible reasons:

Search Words

HTTP Error 503. The service is unavailable.

The worker process failed to initialize correctly and therefore could not be started

Event ID 2276

Service Unavailable

A process serving application pool 'PleskControlPanel' terminated unexpectedly.

503 service unavaliable

Site doesn't exist (Error code 1)

85a92ca67f2200d36506862eaa6ed6b8 56797cefb1efc9130f7c48a7d1db0f0c a914db3fdc7a53ddcfd1b2db8f5a1b9c 46a8e394d6fa13134808921036a34da8 bd7fc88cf1b01f097749ae6f87272128 ed7be2b984f9c27de1d2dc349dc19c6d a766cea0c28e23e978fa78ef81918ab8 514af229ae32522202a910a2649c80fb

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