When you login to SharePoint 2013 you’ll notice the “Sign in as Different User” is missing from the Personal Menu.

112014_1627_loginasdiff1

Here are two workaround options:

  1. Manually append the following URL to your site:
    /_layouts/closeConnection.aspx?loginasanotheruser=true
  2. Add a Custom Action to the SharePoint Personal Menu:
<?xml version="1.0" encoding="utf-8"?>
<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <CustomAction											
    Id="MyLoginDifferentUser"
    GroupId="PersonalActions"
    Location="Microsoft.SharePoint.StandardMenu"
    Sequence="1000"
    Title="Sign in as Different User">
    <UrlAction Url="/_layouts/closeConnection.aspx?loginasanotheruser=true"/>
    </CustomAction>
</Elements>

   

Click here to download Custom Action Solution