Today I had to login to a SharePoint 2013 site with the farm account, from my desktop.
I simply add “/_layouts/closeConnection.aspx?loginasanotheruser=true” after the site URL :
http://MyProjectSite.contoso.com/Sites/Shp4DummiesProjects/_layouts/closeConnection.aspx?loginasanotheruser=true
Voilà,
That’s all Folks !!!