SharePoint 2013, Sign in different user

1. Start your browser as a different user
2. Use the _layouts/closeConnection.aspx?loginasanotheruser=true page
3. Edit the Welcome.aspx to include the link again (Sign in as Different User and SharePoint 2013)
4. Use JavaScript as a Bookmarklet (SharePoint 2013 – Sign in as Another User)

problems with sign in different user functionality

• • Caching problems
• • Documents opened in external applications are saved with an unexpected user account
• • Right after user logs in with a different account, the page content shows information from the previous account and the cookies are not properly cleared

Solution 1

1. Locate the file \15\TEMPLATE\CONTROLTEMPLATES\Welcome.ascx and open in a text editor.
2. Add the following element before the existing element with the id of  “ID_RequestAccess”

<SharePoint:MenuItemTemplate runat="server" ID="ID_LoginAsDifferentUser" Text="<%$Resources:wss,personalactions_loginasdifferentuser%>" Description="<%$Resources:wss,personalactions_loginasdifferentuserdescription%>" MenuGroupId="100" Sequence="100" UseShortId="true"/>

1. Save the file.

Solution 2

Navigate to the close connection page url

http://<site URL>/_layouts/closeConnection.aspx?loginasanotheruser=true

custom action solution 

http://www.kaboodlekonnect.com/free/alt-login