Problem: When trying to upgrade the SharePoint to a higher service pack you encounter this error in the log

[OWSTIMER] [SPUpgradeSession] [ERROR] [11/3/2014 2:56:24 PM]: Upgrade Timer job is exiting due to exception: Microsoft.SharePoint.Upgrade.SPUpgradeException: Action 4.0.14.0 of Microsoft.SharePoint.Upgrade.SPIisWebSiteWssSequence failed. —> System.Runtime.InteropServices.COMException (0x80070003): The system cannot find the path specified.

One probably cause is the someone manually changed the Application Pool account from IIS Manager instead of using SharePoint Central Admin.

Solution:

  1. Go to the Central Administration
  2. In the CA go to Application Management->Manage services on server
  3. Stop Microsoft SharePoint Foundation Web Application #This removes the SharePoint iis configuration
  4. Start Microsoft SharePoint Foundation Web Application #This recreates the SharePoint iis websites.
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