Determine the authentication (logon) Domain Controller

An easy way to determine what Domain Controller authenticated a person at logon. This can come in handy when troubleshooting slow logons and troubleshooting logons for roaming laptop users.

From the workstation, start a command prompt.
Type “set” (for settings)
Find the “LOGONSERVER=” line
or
just Type set l
That’s it!

or download vbscript(login server info.vbs) from My Share box..