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Merge pull request #8195 from rafx75/docs-editor/cannot-connect-rds-no-license-1739266550
AB#3836: Update cannot-connect-rds-no-license-server.md
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support/windows-server/remote/cannot-connect-rds-no-license-server.md

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title: Cannot connect to RDS because no RD Licensing servers are available
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description: This article describes how to troubleshoot RDS connection errors that are related to Remote Desktop licensing.
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ms.date: 02/08/2025
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ms.date: 02/13/2025
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manager: dcscontentpm
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audience: itpro
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ms.topic: troubleshooting
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The following table shows which RDS CAL and RD Session Host versions are compatible with one another.
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| |RDS 2008 R2 and earlier CAL |RDS 2012 CAL |RDS 2016 CAL |RDS 2019 CAL |
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| --- | --- | --- | --- | --- |
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|**2008, 2008 R2 session host** |Yes |Yes |Yes |Yes |
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|**2012 session host** |No |Yes |Yes |Yes |
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|**2012 R2 session host** |No |Yes |Yes |Yes |
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|**2016 session host** |No |No |Yes |Yes |
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|**2019 session host** |No |No |No |Yes |
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|Session host version|RDS 2016 CAL|RDS 2019 CAL|RDS 2022 CAL|RDS 2025 CAL|
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| -------- | -------- | -------- | -------- | -------- |
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|Windows Server 2016 session host|Yes|Yes|Yes|Yes|
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|Windows Server 2019 session host|No|Yes|Yes|Yes|
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|Windows Server 2022 session host|No|No|Yes|Yes|
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|Windows Server 2025 session host|No|No|No|Yes|
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The following table shows which RDS CAL and license server versions are compatible with one another.
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| |RDS 2008 R2 and earlier CAL |RDS 2012 CAL |RDS 2016 CAL |RDS 2019 CAL |
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| --- | --- | --- | --- | --- |
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|**2008, 2008 R2 license server** |Yes |No |No |No |
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|**2012 license server** |Yes |Yes |No |No |
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|**2012 R2 license server** |Yes |Yes |No |No |
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|**2016 license server** |Yes |Yes |Yes |No |
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|**2019 license server** |Yes |Yes |Yes |Yes |
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|License server version|RDS 2016 CAL|RDS 2019 CAL|RDS 2022 CAL|RDS 2025 CAL|
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| -------- | -------- | -------- | -------- | -------- |
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|Windows Server 2016 license server|Yes|No|No|No|
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|Windows Server 2019 license server|Yes|Yes|No|No|
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|Windows Server 2022 license server|Yes|Yes|Yes|No|
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|Windows Server 2025 license server|Yes|Yes|Yes|Yes|
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For more information, see [RDS CAL version compatibility](/windows-server/remote/remote-desktop-services/rds-client-access-license#rds-cal-version-compatibility).
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