Today I tried to open my site which is in SharePoint 2013 and I got this message
"This operation can be performed only on a computer that is joined to a server farm by users who have permissions in SQL Server to read from the configuration database. To connect this server to the server farm, use the SharePoint Products Configuration Wizard, located on the Start menu in Microsoft SharePoint 2010 Products".
So I research on net and found that I have to give permission in SQL server which was given to all users.
-Amar Trivedi
