Once the 180-day evaluation has expired, your Windows Server usually shuts itself down again within 30 minutes of starting. You have two options: reset the trial period with slmgr /rearm while rearms are left, or add your own license.

We do not sell Windows licenses. Our Windows Servers run with an evaluation, and you bring your own license.

Back to work quickly

  1. Start the server in the control panel.
  2. Log in right away via RDP or VNC, you only have a few minutes.
  3. Open the command prompt as administrator and check with slmgr /dlv how many rearms are left.
  4. If the number is greater than 0, reset the period and restart.
slmgr /rearm
shutdown /r /t 0

The rearm only takes effect after the restart, then you have another 180 days. This usually works up to five times. All commands with explanations are in Windows Server Rearm: Extend the Trial Period with slmgr /rearm.

No rearms left

Then only a license helps. With a valid product key you convert the evaluation into a full version using DISM, without reinstalling. The commands are in the rearm article. A reinstall is also possible but deletes all data on the server.

Automatic rearm

If you set up Windows on a vServer using the automatic installation in the Cloud Manager and the Guest Agent is running, a cron job takes care of the rearm. You only need to restart the server afterwards. This is best effort without guarantee, so check the status yourself with slmgr /xpr. Dedicated servers and installations from your own ISO do not have this automation.

Common pitfalls

  • Too slow: Run the rearm right after logging in, before doing anything else. Otherwise the server shuts down in the middle of your work.
  • No restart: Without a restart after slmgr /rearm the old deadline keeps running.
  • Permanent use without activation: The evaluation is meant for testing. Running Windows Server permanently without a license violates Microsoft’s license terms.