How To Apply & Activate RDS CALs
on Windows Server 2025
Complete step-by-step guide to installing required roles and features, configuring Group Policy, and activating your Windows Server 2025 RDS Device CAL through the Remote Desktop Licensing Manager. Genuine CAL key — instant delivery across USA & Canada.
Windows Server 2025 RDS CALs (Remote Desktop Services Client Access Licenses) are required for every user or device that connects to your Windows Server 2025 via Remote Desktop Services beyond the default 2 administrative connections. Without valid RDS CALs installed and activated through the Remote Desktop Licensing Manager, connecting clients will be refused access once the 120-day grace period expires. This guide walks you through every step — from installing the required server roles and features to activating your RDS CALs.
👤 User CAL
One licence per named user account
- Licensed per user: One CAL covers a single user connecting from any number of devices — desktop, laptop, tablet, or phone.
- Example: A remote employee who uses a home PC, a work laptop, and a mobile device. One User CAL covers all their connections.
- Best for: Remote and hybrid workforces, BYOD environments, users connecting from multiple devices.
🖥 Device CAL
One licence per physical device
- Licensed per device: One CAL covers a single device regardless of how many different users log in from it.
- Example: A shared workstation in a call centre used by multiple shift workers. One Device CAL covers the machine.
- Best for: Shared workstations, kiosks, thin clients, or shift-work environments where one device serves many users.
🌐 Access from Anywhere
Give users secure access to their full Windows desktop and applications from any location and device — delivering a consistent, centralised experience hosted on your server infrastructure.
💰 Reduced IT Costs
Centralise application deployment on one server instead of maintaining individual licences and upgrades on every workstation — significantly reducing software and hardware costs across the organisation.
🔐 Data Security
Keep sensitive business data on the server rather than on endpoint devices — data never leaves the data centre, reducing risk from lost or stolen devices. Enhanced with Windows Server 2025's Secured-Core security.
⚡ Simplified Administration
Deploy, update, and patch applications once on the server and all users receive the update immediately — reducing IT administration overhead and ensuring consistent software versions across all users.
🔑 Don't have an RDS CAL key yet? Get your genuine Windows Server 2025 RDS Device CAL at the best price — instant digital delivery across USA & Canada.
Buy Your CAL Key Now →Before activating your RDS CALs, you must ensure the correct Roles, Role Services, and Features are installed and running on your Windows Server 2025. The RD Licensing Manager will not function correctly without these components in place.
✅ Required Roles, Features, Role Services & Group Policy
🟦 Server Role
Remote Desktop Services
Install via: Server Manager → Add Roles and Features → Role-based or feature-based installation → Remote Desktop Services
🟦 Role Services
Remote Desktop Licensing
Installs the RD Licensing Manager — the tool used to activate and manage your CAL keys. Required for this guide.
Remote Desktop Session Host
Enables clients to connect to the server for Remote Desktop sessions. Required for multi-user RDS deployments.
🟦 Features (Role Administration Tools)
Remote Desktop Licensing Diagnoser Tool
Path: Server Manager → Add Roles and Features → Features → Role Administration Tools → Remote Desktop Services Tools → Remote Desktop Licensing Diagnoser Tool
Remote Desktop Licensing Tools
Install alongside the Diagnoser Tool. Path: Features → Role Admin Tools → Remote Desktop Services Tools → Remote Desktop Licensing Tools
🟦 Group Policy Configuration
Specify Your Server as the RD Licence Server
Path: Group Policy Management → Computer Configuration → Administrative Templates → Windows Components → Remote Desktop Services → Remote Desktop Session Host → Licensing
Enable "Use the specified Remote Desktop license servers" → enter your server name.
Enable "Set the Remote Desktop licensing mode" → set to Per User or Per Device to match your CAL type.
gpupdate /force in an Administrator Command Prompt to apply Group Policy changes immediately without waiting for the next refresh cycle.
Verify All Requirements Are Met
Before opening the Licensing Manager, confirm every item in the prerequisites checklist above has been completed:
Role installed: Remote Desktop Services role is installed and running on your server.
Role Services installed: Remote Desktop Licensing and Remote Desktop Session Host role services are both installed.
Features installed: Remote Desktop Licensing Diagnoser Tool and Remote Desktop Licensing Tools are installed under Role Administration Tools.
Group Policy configured: Your server is specified as the Remote Desktop Licence Server in Group Policy, and the licensing mode (Per User or Per Device) is set to match your CAL type.
gpupdate /force before proceeding to Step 2.Open Remote Desktop Licensing Manager
Open the Remote Desktop Licensing Manager from Server Manager:
Open Server Manager from the taskbar or Start menu.
Click the Tools menu in the top-right corner of Server Manager.
From the Tools menu, navigate to Terminal Services (or Remote Desktop Services) → select Remote Desktop Licensing Manager.
licmgr.exe, and pressing Enter.Right-Click Your Server and Choose "Activate Server"
In the Remote Desktop Licensing Manager window, activate your server with Microsoft before installing any CALs:
In the RD Licensing Manager, locate your server name in the left panel or main listing.
Right-click your server name and select "Activate Server" from the context menu.
The Activate Server Wizard will open. Click Next to begin.
Complete the Activate Server Wizard
Work through each screen of the Activate Server Wizard:
Select your connection method: We recommend choosing "Automatic connection (recommended)" — this activates your server online using Microsoft's activation servers automatically and is the fastest method.
If your server has no internet access, select "Web Browser" to complete activation on another internet-connected device, or "Telephone" for phone-based activation.
Fill in the required company information fields — Company Name, Country/Region, and optionally your name, email, and other optional fields. This information is used for the Microsoft Volume Licensing database and is required to complete the activation.
At the end of the wizard, ensure the checkbox "Start Install Licenses Wizard now" is checked before clicking Finish. This automatically launches the Install Licenses Wizard as the next step — saving you from having to launch it manually.
activate.microsoft.com. Use the Web Browser or Telephone method if automatic activation is not available.Install Your RDS CAL Licences
With the server activated, complete the Install Licenses Wizard to apply your RDS Device CAL key from MMKeys:
The Install Licenses Wizard launches automatically if you checked the option at the end of Step 4. If it did not launch, right-click your server in RD Licensing Manager and select "Install Licenses".
On the Licence Program page, select "License Pack (Retail Purchase)" from the dropdown list — this is the correct programme for keys purchased from MMKeys. Click Next.
When prompted, click Next again to proceed to the product key entry screen.
Enter your RDS Device CAL product key from MMKeys in the field provided. Copy and paste it directly from your order confirmation email to avoid any typos — a single incorrect character will prevent the key from being accepted.
Click Next (or Add). Microsoft will verify the key and confirm the number of CALs, the licence type (Per User or Per Device), and the Windows Server version they apply to.
Review the licence confirmation details and click Finish to install the licences on your server.
Verify Activation Status & Available Licences
Confirm that your RDS CALs are correctly installed and the server is ready to issue licences to connecting clients:
In RD Licensing Manager, expand your server node. Your installed licence packs will be listed beneath it showing the licence type, quantity, and available count.
Confirm the server Activation Status shows "Activated" and the Available Licences column shows the correct number of CALs matching your purchase.
For a comprehensive diagnostic check, open Remote Desktop Licensing Diagnoser from Server Manager → Tools → Remote Desktop Licensing Diagnoser. This tool verifies the complete licensing configuration and flags any remaining issues.
Your Windows Server 2025 RDS Device CALs are now active. Remote Desktop clients connecting to your server will automatically be assigned a CAL from the available pool.
RD Licensing Manager Shows Server as "Not Activated" After Completing Wizard
Cause: The Activate Server Wizard could not reach Microsoft's activation servers, usually due to a firewall blocking outbound connections or no internet access on the server.
Solution:
- Verify your server has an active internet connection by opening a browser or pinging an external address.
- Ensure outbound TCP port 443 (HTTPS) is allowed through your firewall for connections to
activate.microsoft.comandlicensing.microsoft.com. - In the Activate Server Wizard, switch from "Automatic connection" to "Web Browser" — this generates a URL you can visit on any internet-connected device to complete activation manually.
- Alternatively, select "Telephone" to activate by calling Microsoft's automated phone system — no internet required.
RDS Grace Period Expired — Users Cannot Connect via Remote Desktop
Cause: Windows Server 2025 RDS provides a 120-day grace period without requiring CALs. After this expires, Remote Desktop connections are refused for all non-administrator accounts until valid CALs are installed and activated.
Solution:
- Purchase and activate RDS CALs through the RD Licensing Manager immediately — the 120-day grace period cannot be extended or reset.
- Verify your server is correctly set as the RD Licence Server in Group Policy. Incorrect Group Policy configuration is the most common cause of licence refusals even after CALs are installed.
- Open Remote Desktop Licensing Diagnoser and resolve any issues listed there — it will identify configuration problems preventing CALs from being issued to clients.
- Restart the Remote Desktop Licensing service in Services.msc after making any configuration changes.
"No Remote Desktop Licence Server Is Available" Error on Client Connection
Cause: The RD Session Host cannot locate the RD Licence Server — caused by missing role installation, incorrect Group Policy settings, or network connectivity between the Session Host and Licence Server.
Solution:
- Verify the Remote Desktop Licensing role service is installed on the server via Server Manager → Local Server → Roles and Features.
- Open Group Policy Management and confirm both policies under
Computer Configuration → Admin Templates → Windows Components → Remote Desktop Services → RD Session Host → Licensingare correctly configured:
— "Use the specified Remote Desktop license servers" → Enabled, your server name or IP entered.
— "Set the Remote Desktop licensing mode" → Enabled, set to Per User or Per Device to match your CAL type. - Run
gpupdate /forcein an Administrator Command Prompt on the server to apply Group Policy changes immediately. - Restart the Remote Desktop Licensing service in
services.msc.
100% Genuine CAL Keys
Official Microsoft Client Access License keys — authentic and guaranteed to activate.
Instant Delivery
Your digital CAL key arrives by email seconds after payment — 24/7.
Best Price Guarantee
Discounted Microsoft CAL keys — best price without compromising authenticity.
Lifetime Warranty
Every key carries a lifetime warranty. If it ever fails, we replace it free.
Money-Back Guarantee
Not satisfied? We offer a full money-back guarantee — no questions asked.
24/7 Support
Our technical team is always ready to help with installation or any issue.
🔑 If you don't have a CAL key yet — get your genuine Windows Server 2025 RDS Device CAL at the best price. Instant delivery across USA & Canada.
Get Your CAL Key Here →Buy Windows Server 2025 RDS Device CAL — Genuine Client Access License at the Best Price in USA & Canada
MMKeys.com is your trusted source for genuine Microsoft Client Access License keys across the USA and Canada. Windows Server 2025 RDS Device CALs are required for every device connecting to Windows Server 2025 via Remote Desktop Services — enabling centralised, secure remote access to desktops and applications across your organisation. Available as User CALs or Device CALs, this guide covers the complete setup from installing required roles and features to activating CALs through the RD Licensing Manager.
All our Microsoft RDS CAL keys are 100% authentic and activate directly through Microsoft's official Remote Desktop Licensing system. Buy your cheap Windows Server 2025 RDS Device CAL today and receive your digital activation key instantly by email. Every purchase includes a full lifetime warranty and money-back guarantee — making MMKeys the most trusted source for discounted Microsoft software keys in North America.