Troubleshoot “connection to KMS server failed” error

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I have received a lot of complaint emails saying that they could not activate their program after folowing instructions in my videos. The issues described here are related to an error message they got as below.

The connection to my KMS server failed! Trying to connect to another one… Please wait…
Sorry! Your version is not supported.

There are two main causes of this issue.

1. The cause of client
First of all, please make sure that Windows Update is enabled and your intenret connection is stable. To check if my KMS servers are blocked or not, please open your internet browser then try going to: If the page is visible, it means this server is not blocked.
One other point to note is that you need to run command prompt/batch file with admin rights.

Otherwise, the connection will be denied by UAC system.

2. The cause of server
Recently I need to do some experiments in the kms7 server so I changed the default KMS port (1688) to another one. And besides, I upgraded CPU and RAM memory on the kms8 server.
Because the number of daily clients is too big and still increasing over time, so the server can also be stuck at times. You can check and see if the server is overloaded or not here:

If you feel that your problem still hasn’t been fixed yet, just email me at

Troubleshoot “connection to KMS server failed” error
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If you would have any questions or concerns, please leave your comments. I would be glad to explain in more details. Thank you so much for all your feedback and support!

For faster support, please visit here for troubleshooting. Need more help? Please email me at

4 thoughts on “Troubleshoot “connection to KMS server failed” error

  1. Sean

    This didn’t initially work for me.

    I had remnants of old attempted installs of Microsoft office on my hard drive.

    So i uninstalled everything and used IObit uninstaller powerful uninstall to get all the registry files…supposedly.

    Then I did a fresh install of Microsoft office and ran the “clickonce” as administrator

    It all worked…I didn’t have to sign in…don’t think you could use onedrive or sync to your phone or anything that had to connect outside the computer but I had a working copy of Office 16.

    BUT…when I reboot something must have reset (SOMETHING called home?) because none of it worked. It wanted me to sign in.

    I ran “clickonce” several times…not supported.

    Turned off firewall and microsoft security essential…ran “click once” as admin…not supported.

    If I delete everything (Microsoft Office) do a clean install, run clickonce, it works…until I reboot.

    Anything I can do to keep this from phoning home or whatever it’s doing to reset itself…uninstalling and reinstalling everytime I shut down my computer really isn’t a feasible solution.


  2. Andrew Johns

    I’m still getting this error:

    “The connection to my KMS server failed! Trying to connect to another one… Please wait…
    Sorry! Your version is not supported.”

    Please help.


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