Error: Sorry, we’re having trouble reaching the server

Sorry, we're having trouble reaching the server. The image borrowed from

I ran into a an issue today. When I tried to add a user to a site in my SharePoint 2013 site, I got this error:

Sorry, we’re having trouble reaching the server

A google search gave these two possible solutions:

I know it can almost everything that can cause this error. Here are my two öre :) I found that when I tried to add a user, an ajax call was made. And this was the error:

The Web application at could not be found. Verify that you have typed the URL correctly. If the URL should be serving existing content, the system administrator may need to add a new request URL mapping to the intended application.

Obviosly, the Alternate Access Mappings. What I needed to do was to add the ip-address to my AAM.


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