Troubleshoot “connection to KMS server failed” error

Posted by in Computer Tips | Last updated on

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.

make sure your ran batch file with administrator 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!

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

  1. Andy

    I am on a 30 day trial Office 365
    The connection to my KMS server failed! Trying to connect to another one… Please wait…
    Sorry! Your version is not supported.
    Do I need to wait until trial runs out?

    Thank you

  2. Hrishikanta

    Microsoft Windows [Version 10.0.17134.523]
    (c) 2018 Microsoft Corporation. All rights reserved.

    C:\WINDOWS\system32>slmgr /upk

    C:\WINDOWS\system32>slmgr /ipk W269N-WFGWX-YVC9B-4J6C9-T83GX

    C:\WINDOWS\system32>slmgr /skms

    C:\WINDOWS\system32>slmgr /ato

    after giving successful notification till msguides
    windows can’t activate with the notification
    Activating Windows(R), Professional edition
    (2de67392-b7a7-b1ca-108dd189f588) …
    Error: 0xC004F074 The Software Licensing Service reported that the
    computer could not br activated. No key Management service (KMS)
    could be contacted. Please see the Application Even Log for additional information.