hi friends actually i updated my windows server2012 r2 and windowsserver ask me to change the password then i changed password after that i started SharePoint 2013 central administration. the page showing me an error “Service Unavailable
HTTP Error 503. The service is unavailable.”
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I’m going to agree with Beau. One of your app pools isn’t running.
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Todd Colstrom commented on answer February 15, 2017
Go to each server in the farm (there may be only one server from the info in your original post, but I wasn’t sure), open Internet Information Services (IIS), expand the server node, and click Application Pools. Make sure the application pools for all your sites (including SharePoint Central Admin) are running and not in a stopped state.
then how to solve this problem please let me know