If you’re using Microsoft Remote Desktop Services (RDS), Remote Desktop Licensing Manager is the tool that allows you to activate your license server, install Remote Desktop Services Client Access Licenses (RDS CALs), and manage user or device licenses. Without proper licensing, Remote Desktop Session Hosts eventually stop accepting new connections after the grace period, making the Licensing Manager essential for every production RDS environment.
Whether you’re deploying Windows Server 2019, 2022, or newer versions, understanding how Licensing Manager works helps ensure compliance, uninterrupted remote access, and easier administration.
What Is Remote Desktop Licensing Manager?
Remote Desktop Licensing Manager is a Microsoft management console (MMC) snap-in used to administer Remote Desktop Services licenses.
With it, administrators can:
- Activate the license server
- Install purchased RDS CALs
- View installed licenses
- Monitor license availability
- Diagnose licensing issues
- Manage User CALs and Device CALs
It is included as part of the Remote Desktop Licensing role service on Windows Server.
Why Remote Desktop Licensing Is Important
Every organization using Remote Desktop Services beyond Microsoft’s temporary grace period must have valid licenses.
Without licensing:
- Users eventually cannot connect
- Session Hosts generate licensing errors
- Compliance issues may arise
- Business operations can be interrupted
Licensing ensures Microsoft allows multiple users to access Remote Desktop Session Hosts legally.
Components of Remote Desktop Licensing
A complete RDS licensing deployment usually includes:
- Remote Desktop Session Host (RDSH)
- Remote Desktop Licensing Server
- Active Directory
- Group Policy
- Remote Desktop Licensing Manager
- RD Connection Broker (optional)
The Licensing Manager communicates with Session Hosts to validate available licenses.
Types of RDS CALs
Microsoft offers two primary licensing models.
User CAL
A User CAL licenses one user.
Advantages:
- Access from multiple devices
- Great for remote workers
- Flexible
Best for:
- Employees
- Hybrid work
- Office staff
Device CAL
A Device CAL licenses one physical device.
Advantages:
- Shared computers
- Lower cost in some environments
Best for:
- Schools
- Factories
- Kiosks
- Libraries
User CAL vs Device CAL
| Feature | User CAL | Device CAL |
|---|---|---|
| License Assigned To | User | Device |
| Multiple Devices | Yes | No |
| Shared Computers | No | Yes |
| Remote Workers | Excellent | Limited |
| Flexible | High | Moderate |
| Best For | Businesses | Labs & Schools |
Licensing Modes
Remote Desktop Session Host supports two licensing modes.
Per User
- One license per employee
- Flexible
- Common in businesses
Per Device
- One license per computer
- Ideal for shared workstations
The Session Host licensing mode must match the installed CAL type.
Installing Remote Desktop Licensing Manager
Installation is straightforward.
Step 1
Open:
Server Manager
Select:
Add Roles and Features
Step 2
Choose:
Remote Desktop Services
Step 3
Select:
Remote Desktop Licensing
Install the required components.
Step 4
Restart the server if prompted.
Step 5
Open:
Tool → Remote Desktop Services → Remote Desktop Licensing Manager
The console should now appear.
Activating the License Server
A newly installed Licensing Server must be activated.
Steps
Open Licensing Manager.
Right-click the server.
Select:
Activate Server
The Activation Wizard opens.
Choose:
- Automatic connection
- Web Browser
- Telephone
Automatic is recommended.
Complete the wizard.
Your license server is now activated.
Installing RDS CALs
After activation:
Right-click the server.
Select:
Install Licenses
Enter:
- License Program
- Agreement Number
- Authorization Number
- Product Key
The wizard installs the purchased CALs.
Once complete, they appear in Licensing Manager.
Configuring the Session Host
The Session Host must know which licensing server to use.
This can be configured using:
- Group Policy
- PowerShell
- Server Manager
Group Policy is recommended.
Navigate to:
Computer Configuration Administrative Templates Windows Components Remote Desktop Services Remote Desktop Session Host Licensing
Configure:
- Use the specified Remote Desktop license servers
- Set the licensing mode
Verifying Licensing Configuration
Run:
gpupdate /force
Restart the Remote Desktop Service.
Open:
RD Licensing Diagnoser
The Diagnoser verifies:
- License server discovery
- CAL installation
- Licensing mode
- Server activation
Common Licensing Errors
Grace Period Expired
Symptoms:
- Users cannot connect
Solution:
- Install CALs
- Configure licensing mode
- Specify the license server
License Server Not Available
Causes:
- Firewall
- DNS
- Incorrect server name
Solution:
- Verify connectivity
- Check firewall rules
- Restart licensing services
No Remote Desktop License Servers Available
Common reasons:
- License server missing
- Group Policy not configured
- Activation incomplete
Licensing Mode Mismatch
Example:
Server configured:
Per User
Installed CAL:
Per Device
Result:
Licensing failures.
Always match both settings.
Checking Installed Licenses
Open Licensing Manager.
Expand:
Server
You’ll see:
- Installed license packs
- Available licenses
- Issued licenses
- License type
- Expiration status
PowerShell Commands
Check installed roles:
Get-WindowsFeature RDS-Licensing Install Licensing Role: Install-WindowsFeature RDS-Licensing Restart Service: Restart-Service TermService
Update Group Policy:
gpupdate /force
Best Practices
Follow these recommendations:
- Activate the license server immediately
- Keep Windows Server updated
- Back up licensing information
- Monitor available CALs
- Match licensing modes correctly
- Use Group Policy instead of manual settings
- Test changes before production deployment
- Document purchased licenses
- Restrict administrative access
- Regularly review event logs
Security Recommendations
Protect your licensing infrastructure.
Recommended practices include:
- Enable Windows Firewall
- Restrict RDP access
- Use strong administrator passwords
- Enable Multi-Factor Authentication (MFA)
- Keep servers patched
- Monitor login attempts
- Use secure backups
Troubleshooting Checklist
| Problem | Solution |
|---|---|
| Grace period expired | Install CALs |
| Users cannot connect | Verify licensing mode |
| License server unavailable | Check DNS and firewall |
| Activation failed | Re-run Activation Wizard |
| No licenses displayed | Install license pack |
| Group Policy ignored | Run gpupdate /force |
| Licensing Diagnoser errors | Verify configuration |
| Event Viewer warnings | Review licensing logs |
Conclusion
Remote Desktop Licensing Manager is a vital component of every Microsoft Remote Desktop Services deployment. It allows administrators to activate license servers, install and manage RDS CALs, monitor license usage, and ensure uninterrupted remote access. By properly configuring licensing modes, activating the server, and following Microsoft’s best practices, organizations can maintain a secure, compliant, and reliable Remote Desktop environment while avoiding costly downtime caused by licensing issues.
