How do I fix connection to KMS server failed?

1. Check your Internet connection

​​Sometimes the error shows only because the internet connection is spotty. If everything looks good, you can proceed with the next steps. If you’re having trouble accessing Command Prompt as an admin, take a look at this guide.

2. Upgrade your Windows OS

Oftentimes, functional problems arise with the KMS server when your Windows OS isn’t correctly licensed. Having an original license not only ensures that your product is legit, fully functional, and reliable, but you also get regular updates that prevent bugs. Besides, upgrading to the latest Windows version is one-time only, so your investment will pay off in the long run.

3. Check if the computer is activated

If it is not activated, you need to do this first and then proceed to activate your Office copy. Still, having issues? Then see how to fix Windows activation errors. Before activating your Office copy, we need to make sure that on the client computer, Windows is activated.

4. Check if you have more than 25 clients

5. Check the client communicated with the host

​​On the KMS host computer, look in the Application event log for event ID 12290. Check this log for requests made by the client’s computer. If there are no requests, it means that the client could not communicate with the host.

6. Open the right port

Make sure that there are no firewall rules that block TCP traffic on the KMS port. The default port value is 1688. If you don’t know the port you can find that out on your host computer.

7. Configure DNS properly for multiple KMS hosts

When using KMS, the host computer must be discoverable in your local network. The first host computer automatically publishes its existence when it creates a SRV record on the DNS server. The rest of the hosts cannot change or update SRC if the DNS server is not configured properly.

8. Newly added computers don’t increase the KMS count

Sometimes client computers look identical to the host and therefore it doesn’t count them as separate. Finally, if you are still having issues, you can switch to an AD-based activation by following the official documentation.

Can you have 2 KMS servers?

It is not recommended to have more than one KMS server for Windows and Office as it puts additional work into implementing and managing it properly. If you have any other questions or suggestions, don’t hesitate to reach out in the comments section below.

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