An unexpected error occurred on a receive.

May 23, 2016 at 4:58 PM
In Development script is working fine, but in production environment I am getting following error message for few sites collections.

Here is the Error message :
. Url : http://portal.com
. Time : 0.51 seconds
. Status : The underlying connection was closed: An unexpected error occurred on a receive.

Could you please let me know the issue.

I am able to access http://portal.com