EthoVision XT 19 - Troubleshooting: Installation and license (Continued)
Last updated: Jul 29, 2026
My EthoVision XT License Has Expired. What Should I Do?
- Contact Noldus to purchase a new license. See Noldus Support.
- Start EthoVision XT.
- A message says No License key found. Choose Activate software license key.
- Choose either Floating or Computer-locked depending on how you want to use the software. See Types of EthoVision XT license.
- Click OK and enter the new software activation key that you received from Noldus. See Activate your EthoVision XT license.
I Purchased an Add-On Module but I Cannot Use It
Choose Help > About EthoVision XT > License info to view which modules are enabled on your EthoVision XT system.
See Upgrade EthoVision XT. If necessary, contact Noldus for help.
I Purchased an Add-On Module. How Do I Update My License?
This depends on whether you have a software license or a license stored on the USB hardware key. See Add new modules to your license.
TIP To know which modules are included currently in your license, choose Help > About EthoVision XT > License Info. See also Modules of EthoVision XT.
I Cannot Start EthoVision XT with a Floating License
This occurs when a floating license was not deactivated on one of the other computers before starting EthoVision XT on that computer. This could happen for example when EthoVision XT is closed on a computer that has a floating license but currently no internet connection. Restart EthoVision XT on that computer and make sure that the computer is connected to the internet, then close EthoVision XT. Then start EthoVision XT on the computer you want to work with.
NOTE With a floating license, all EthoVision XT computers must have an internet connection. See Types of EthoVision XT license. However, you can work offline with EthoVision XT under a floating license for a maximum of 90 days. After that, you must re-connect the EthoVision XT PC to the internet in order to continue to work with the software.
See also Software license - offline.
I Entered a License Key but an Error Message Shows a Different One
Contact Noldus for support. Contact the Noldus Support.
Which Port Do I Need to Access the Server?
You need port 443.
The Deactivate License Option Is Greyed Out
Close the experiment, then select Help > Deactivate license.
Working with a Full License
After starting EthoVision XT, you can work in Analysis mode, but the dialog that offers to work with the full license does not show up.
- Close the experiment (if open).
- Choose Help > Deactivate License.
- Click Continue. EthoVision XT will now close.
- Insert the hardware key in the PC or have the license key ready.
- Start EthoVision XT and choose how to activate the license.
Message "Activation Not Complete"
This may be caused by the following reasons:
- A wrong or expired license key was entered in the previous step of the activation procedure. Click Back, and enter the license activation key that you received from Noldus.
- The computer may temporarily be disconnected from the internet. Check the internet connection and repeat the license activation procedure.
- The license may have been revoked, or is expired. Please contact your Noldus representative to purchase a new license.
Message "License Already Activated..."
After trying to activate a license, EthoVision XT (or the Noldus page displayed on your smartphone) shows a message:
The license [license number] has already been activated on a system called [computer name].
The license that you are trying to activate is still active on another computer.
- Deactivate the license on the first computer. See Deactivate an EthoVision XT license.
- Activate the license on the second computer. See Activate your EthoVision XT license.
It is possible that EthoVision XT was removed from the first computer, but the license is still active there. Please re-install EthoVision XT in order to deactivate the license on the first computer. See Install EthoVision XT.
Source: EthoVision XT 19 Help, Noldus Information Technology