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https://issues.apache.org/jira/browse/GUACAMOLE-1236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17259693#comment-17259693
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Nick Couchman commented on GUACAMOLE-1236:
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[~henry1491]: I can connect to Windows Server 2019 from Guacamole 1.2.0 without
any registry hacks or tweaks, without any Group Policy updates, and without any
patches to Guacamole. I'm using NLA security, which is the default level
required for Windows Server 2019 (and many prior versions of Windows).
> 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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