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After installing Sharepoint 2010 I am getting an error in Central Administration:

"HTTP Error 503. The service is unavailable"

Everthing was working fine, but after some time the central admin shows this error. The IIS service is getting stopped automatically.

share|improve this question… after 2 days of struggle finally The blog helped me :) – Nikhil Jangle Feb 6 '11 at 12:24

Just in case the linked web site with the solution might not be accessable in future, here a short summery of what caused the error:

A domain group policy overrided an permission of the application pool accounts called “Log on as a batch job”. Without this permission the app pool cannot run properly.

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