Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Licensing Policies to Set: "Use the specified Remote Desktop license servers" "Set the Remote Desktop licensing mode" Check Network Connectivity
If the Remote Desktop Services (RDS) are the engine of a corporate jet, the Licensing Diagnoser is the mechanic that reads the engine’s mind. Technically, it is a built-in diagnostic tool (part of Server Manager or accessible via licensingdiag.exe ) that scans your environment for the most common reasons why a user cannot log in remotely.
Choose RD Licensing Diagnoser from the list. rd licensing diagnoser
Open the on your license server to ensure your CALs are not only installed but also "Activated." If you have Per User CALs, ensure the server is a member of the "Terminal Server License Servers" group in Active Directory. Conclusion
This indicates a network or firewall issue. The Diagnoser cannot ping the License Server. Open the on your license server to ensure
You can access the tool via :
The RD Licensing Diagnoser is a tool provided by Microsoft to help diagnose and troubleshoot issues related to Remote Desktop licensing. Here's what it does: You can access the tool via : The
Even if you have a valid License Server set up elsewhere, if you didn't tell the Session Host to use it within that 120-day window, the Diagnoser is the only thing that will clearly tell you why every login attempt is being rejected.
Consider the fictional "LogiCorp." Last Friday, their IT admin migrated the RDS role to a new VM. He forgot to transfer the licensing role.
For every admin who has spent three hours googling "RDS error 0x0," the Diagnoser is the reminder that sometimes, the most complex problems have the simplest solutions. You just need the right tool to ask the right question.
When the Diagnoser opens, it scans the local server configuration. If everything is healthy, the status will appear green. However, if there are issues, you will see red X marks and warning messages. Here are the three most critical errors you will encounter and how to resolve them: