http error 503 the service is unavailable

I got this error while opening Sharepoint 2010 Central admin in IE with IIS 7.

I tried restarting the application pool , but no luck.

In the event viewer, I found the following log entry.

Application pool SharePoint Central Administration v4 has been disabled. Windows Process Activation Service (WAS) encountered a failure when it started a worker process to serve the application pool.

Solution

If you have changed your windows password recently

and you didn't updated you managed account, then you are likely to get this error.

To fix this, go to identity of the application pool, and change it giving the latest password.
and restart the app pool.You are done!!!