One of my Web Application in SharePoint 2013 shows error
“HTTP Error 503. The service is unavailable”
I checked in IIS Application pool and Start the respective service but the error still persist
Thanks In Advance
Is it Kerberos or NTLM?
As Ajeet mentioned below, it sounds like a service account credentials problem. Let us know what happens after you update the applicable password and restart the webapp in IIS.