Fix for HTTP Error 503. The service unavailble-
All my developement is through my SharePoint VM, and the server is configured to use service accounts as part of the best practices. So far so good, but what happens when the service account password has got changed after SharePoint installation.
As per our company policy password for my service account is set to expire every 90 days, and if I change the password of my service account, I will not be able to access my sites and it will throw "Service Unavailable HTTP Error 503. The service is unavailable."