Why am I getting the message: "This NComputing device is not authorized to use the version of vSpace Pro to which you are connecting"?

We have an article that explains this in detail. We encourage you to read it carefully:
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This NComputing device is not authorized to use the version of vSpace Pro to which you are connecting...
Message Context If you see this message when using your NComputing unit, your NComputing device(s) (L250, L300 or M300) was manufactured prior to January 1st, 2015. You can quickly check the date of manufacturing by looking on the sticker under the ...
Understanding AMP Licensing: AMP for vSpace vs. Device AMP
Introduction The Annual Maintenance Program (AMP) from NComputing is a family of support and software maintenance plans designed to enhance the value of your NComputing environment. However, it's important to understand that there are two distinct ...
Device shows a black screen when connecting to vSpace Pro and returns to Server List menu.
This article assumes that you are using vSpace Pro Enterprise, or 11.3.2 LTS and are using L250, L300 or M300. Any other version of vSpace, as of the writing of this article is not supported. If your terminal displays this behavior, the device was ...
Using vSpace Pro Enterprise Edition Without an AMP for vSpace Subscription
Introduction Annual Maintenance Program (AMP) for vSpace Pro is a premium subscription service that ensures: full access to vSpace Pro Enterprise Edition, ongoing support for legacy NComputing devices, and enhanced technical support. It provides ...
vSpace Pro Installation - Tips, References and Process Detail
Published The following article is a detailed process and tips for installing our vSpace Pro platform (vSpace Pro LTS, vSpace Pro Enterprise Edition). As an additional supplement, this article will deal with all other aspects of Pre-Deployment and ...