How to Find Which Logon Server You Authenticated to (Domain Controller)

There are times when you need to determine which domain controller you have authenticated to. This can be helpful for a number of reasons such as troubleshooting group policy, slow logins, application issues, map network drives or printers, and so on.

For example, recently I ran into an issue where single sign-on was not working for multiple applications. I was troubleshooting the issue on multiple virtual desktops and noticed that single sign on was working on one of them. I thought this was strange considering all the virtual desktops were the exact same. That is when I checked which domain controller it authenticated against and noticed it was DC2 and all the others were DC1.

How to Check Logon Server

You can check the logon server with either the command line or PowerShell.

Option 1 – Using the Command Line

Open the command line, type the command below, and press enter

set l

In the screenshot above I authenticated to the DC2 domain controller. The set l command displays everything from the set command that starts with l so it’s displaying the localappdata also. You could just type set logon to see only the logonserver.

Option 2 – Using PowerShell

Open PowerShell, type the command below, and press enter

$env:LOGONSERVER

Find Domain Controller Group Policy Was Applied From

If you need to know which domain controller a computer or user applied its group policy settings from then run the gpresult /r command.

gpresult /r

You can see in the above screenshot the group policy was applied from DC2.

Make sure you check the user settings section as the policy could apply from a different domain controller.

 

3 Comments

  1. Thomas on April 25, 2021 at 11:13 am

    Hi Robert
    Thanks for the tips. They are very useful for troubleshooting.

  2. Bruce St Clair on July 1, 2021 at 3:37 pm

    in a command prompt you can also use “echo %logonserver%” to find out what server you authenticated to.

    • Robert Allen on July 3, 2021 at 3:08 pm

      Good one. Thanks for sharing.

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