Enable Sign in as Different User Option in SharePoint 2013

1) Locate and then open the following file in a text editor:
C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\ TEMPLATE\CONTROLTEMPLATES\Welcome.ascx

2) Add the following element before the existing "ID_RequestAccess" element:

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

3) Save the file

Alternative Access Mapping for a SharePoint Farm

We have to add Alternative Access Mapping for all application severs.

Then we have add Alternative Access Mapping for Intranet zone.

Other wise users getting FILE NOT FOUND ERROR.

Save SharePoint List as a Template giving an error

When we are going to save a SharePoint List with huge data, it gives an error.

Simply because of Data size.

So we have to increase template size using STSADM

It is easy.