The Remote server returned an error(503) server unavailable or The HTTP service located at http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc is too busy

The Remote server returned an error(503) server unavailable 
(or ) The HTTP service located at http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc is too busy

Issue: when we try to browse the SharePoint site, we should get the error “The Remote server returned an error(503) server unavailable”. 

 or The HTTP service located at http://localhost:32843/SecurityTokenServiceApplication/securitytoken.svc is too busy

Solution: the issue occur is due to the security Token service application pool. Follow the below steps to resolve the issue.

 1.    Ensure that the password provided to the user name for Token application pool is correct.

2.    Ensure that the “security Token service application” is in started state

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