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https://issues.apache.org/jira/browse/GUACAMOLE-1236?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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R Aspinwall reopened GUACAMOLE-1236:
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Both Windows Remote Desktop connection and Reminia can successfully connect to
Windows 2019 without registry hacks, the Guacamole SSL/RDP client can not
connect without the Registry Hack. This is a bug which needs to fixed
> Guacamole 1.2.0 can not make RDP connection to Windows 2019 Server
> ------------------------------------------------------------------
>
> Key: GUACAMOLE-1236
> URL: https://issues.apache.org/jira/browse/GUACAMOLE-1236
> Project: Guacamole
> Issue Type: Bug
> Components: RDP
> Affects Versions: 1.2.0
> Environment: Ubuntu 20.04 Server running Guacamole 1.2.0
> Reporter: R Aspinwall
> Priority: Major
>
> Found that old Guacamole 0.9.14 server would not establish an RDP to Windows
> 2019 Server, but was able to connect using Windows RDP client.
> After experimentation on the Windows 2019 Server, I found a Group Policy
> setting which would allow Guacamole 0.9.14 to make an successful RDP
> connection.
> Modify Group Policy (for Guacamole 0.9.14)
> Computer Configuration -> Administrative Templates -> Windows Components ->
> Remote Desktop Service -> Remote Desktop Session Host -> Security -> Require
> use of specific security layer for remote (RDP) connections - Enable (and
> set to policy to negotiate)
>
> Tried with Guacamole 1.2.0 on our new server and to get it to work I had to
> change the Group Policy
> Modify Group Policy (for Guacamole 1.2.0)
> Computer Configuration -> Administrative Templates -> Windows Components ->
> Remote Desktop Service -> Remote Desktop Session Host -> Security -> Require
> use of specific security layer for remote (RDP) connections - Enable (and
> set to policy to RDP)
>
> There is a bug in Guacamole RDP client in 1.2.0 in that it can not negotiate
> RDP or SSL connectivity with Windows 2019 Server. When you configure Windows
> 2019 to use SSL in the Group Policy object above the connection fails, if set
> to negotiate it fails it only works with set to RDP
>
>
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