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We have done system scratch so now i want to setup again window server. Now i want to installation same RDS cal

Jogesh Kumar (Nokia) 0 Reputation points
2026-06-12T07:36:13.7766667+00:00

We have done system scratch so now i want to setup again window server. Now i want to installation same RDS cal

How we can RDS cal

reactivate these key

Windows for business | Windows Server | Devices and deployment | Licensing and activation
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  1. Chen Tran 10,560 Reputation points Independent Advisor
    2026-06-12T08:43:42.9766667+00:00

    Hello Jogesh,

    Thank you for posting question on Microsoft Windows Forum!

    Based on your query of reinstalling the same RDS CALS. Well! Reusing your RDS CALs after a system rebuild is a straightforward process through the Microsoft Clearinghouse. You might need to activate your new license server and then use the official portal or a wizard to migrate your existing licenses to the new server's unique ID. This process can be done online or by phone, and then you must reconfigure your session host to point to the new license server.

    In case, you get a "License code is already activated" error during the web or console process, you must contact the Microsoft Clearinghouse directly by phone. You can find the phone number in the Remote Desktop Licensing Manager when you attempt to activate your server and choose the "Telephone" option. A support agent will then verify your ownership and manually reset the license pack.

    The following articles might be useful for setting up the Windows Server again.

    Hope the above information is helpful!

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  2. AI answer

    2026-06-12T07:36:27.0333333+00:00

    To use the same RDS CALs after reinstalling Windows Server, the Remote Desktop license server must be installed, activated, and then the CALs reinstalled or moved according to how they were originally obtained.

    1. Install and activate the RD Licensing role
      1. In Server Manager, select Manage > Add Roles and Features.
      2. Choose Role-based or feature-based installation and select the server.
      3. On Server Roles, select Remote Desktop Services, then include Remote Desktop Licensing.
      4. Complete the wizard and install.
      5. Open Remote Desktop Licensing Manager and activate the license server as described in Activate the Remote Desktop Services license server.
    2. Reinstall the same RDS CALs on the rebuilt server
      1. Open Remote Desktop Licensing Manager.
      2. Right‑click the license server name and select Install licenses.
      3. Select the program used to purchase the RDS CALs (for example, Volume Licensing, CSP, SPLA, etc.), then select Next.
      4. Enter the license code, agreement number, or 5x5 key that was provided when the CALs were originally purchased.
      5. Select the correct product version, license type (Per User or Per Device), and the number of licenses, then select Next so the server can contact the Microsoft Clearinghouse and retrieve the CALs.
      6. Finish the wizard. The same CALs are now installed and can be issued again.
    3. If CALs must be moved from an old license server If the CALs are still logically tied to an old license server (for example, the old server still exists in records), they can be moved:
      1. Install and activate RD Licensing on the new server.
      2. In the licensing console, set Installation method to Telephone.
      3. Start Install Licenses to obtain the new License Server ID.
      4. Contact the Microsoft Clearinghouse (via the methods listed in the article) and provide the agreement/enrollment number and the new License Server ID.
      5. Receive a new CAL Key Pack ID and enter it in the wizard to install the CALs on the new server.
      6. Deactivate the old license server after the move is complete.
    4. Configure the RD Session Host to use the license server After CALs are installed, configure the RDS deployment so the session host uses this license server and the correct licensing mode (Per User or Per Device), as described in the RD Licensing configuration guidance.

    Once these steps are complete, the same RDS CALs are effectively reactivated on the rebuilt Windows Server and can be issued to users/devices again.

    References:

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