Understanding Windows Server RDS Licensing Errors in Relation to vSpace Pro Session Hosts

Understanding Windows Server RDS Licensing Errors in Relation to vSpace Pro Session Hosts

Overview

This article addresses common error messages related to Windows Server Remote Desktop Services (RDS) licensing issues that customers may encounter when using NComputing vSpace Pro Session Hosts. It aims to clarify that these errors typically arise exclusively from the Windows Server environment and licensing infrastructure, not from the NComputing platform itself.

Common Windows Server RDS Licensing Errors

Below are frequent error messages customers may report, along with brief explanations of what they mean in the context of Windows Server:

  • No Remote Desktop License Servers Available
    The RD Session Host cannot locate an activated license server or valid licenses.
  • Session Disconnected or Session Limits Reached
    Users get disconnected due to license limitations or exceeding session thresholds.
  • Remote Desktop Port Conflict (TCP 3389)
    The default RDP port is blocked or used by another application, preventing connection.
  • Security or Authentication Errors
    Connection attempts fail due to misconfigured security policies or incompatible encryption.
  • Firewall Blocking RDP Traffic
    Network or server firewall rules prevent RDP traffic from passing through.
  • Incorrect or Missing RDS Licensing Configuration
    The license server is not properly configured or not activated, causing license grace period expiration.
  • DNS or IP Resolution Issues Affecting RDP
    Name resolution problems prevent clients from reaching the RDS host.

How to Address Licensing Server Issues

From the perspective of NComputing, Windows licensing servers must be set up and configured correctly with appropriate Client Access Licenses (CALs) before integrating with the vSpace Pro Session Host. Licensing on the Windows Server should be set to per-user mode rather than per-device, as NComputing platforms depend on this configuration.

Once the Windows Server Licensing Server is installed and activated, it should be joined to the NComputing Session Host according to Microsoft's best practices. NComputing support focuses on ensuring its platform works as designed. However, when deployed on Server OS, it does rely on a properly configured Windows Server licensing infrastructure. Licensing errors described above are outside the scope of NComputing platform issues and must be troubleshooted within the parameters of the Windows Server environment. For guidance on these steps, customers should refer to Microsoft Windows Server documentation or consult with their Windows Server administrators.

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Article #KB863

Last Edited: 11/02/2025