MailEnable webmail shows 503 Service Unavailable: Application pool MailEnableAppPool has been disabled

Symptoms

• MailEnable webmail shows error:

  CONFIG_TEXT: HTTP Error 503 Service Unavailable.

• Error in Event Viewer > Windows Logs > System:

  CONFIG_TEXT: Application pool MailEnableAppPool has been disabled. Windows Process Activation Service (WAS) encountered a failure when it started a worker process to serve the application pool.

• The following detailed error can be shown in:

  CONFIG_TEXT: HTTP Error 401.2 - Unauthorized
  Module
  IIS Web Core
  Error Code
  0x80070005
  Physical Path
  C:\Program Files (x86)\Parallels\Plesk\Mail Servers\Mail Enable\Bin\NETWebMail

• Error in Event Viewer > Application:

  CONFIG_TEXT: The identity of application pool MailEnableAppPool is invalid. The user name or password that is specified for the identity may be incorrect, or the user may not have batch logon rights. If the identity is not corrected, the application pool will be disabled when the application pool receives its first request.  If batch logon rights are causing the problem, the identity in the IIS configuration store must be changed after rights have been granted before Windows Process Activation Service (WAS) can retry the logon. If the identity remains invalid after the first request for the application pool is processed, the application pool will be disabled. The data field contains the error number

Cause

All system user credentials/profiles are removed after running sysprep, including the IIS user and the application pool user of MailEnable webmail.

Resolution