When configuring claims / certificates using CRM and PowerShell I was getting the following error:
The remote server returned an error: (503) Server Unavailable
AND
Fail to configure Microsoft Dynamics CRM to use the specified certificate.
I noticed that the Application Pool Service CrmDeploymentServiceAppPool had stopped.
Turns out the service account had Log on as Service enabled but not log on as a batch! Rookie mistake but CRM was working fine (with the AppPool started) so I hadn't noticed it!
