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https://issues.apache.org/jira/browse/GUACAMOLE-1236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247212#comment-17247212
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Nick Couchman commented on GUACAMOLE-1236:
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Please start by posting your question to the mailing list:
http://guacamole.apache.org/faq/#probably-not-a-bug
http://guacamole.apache.org/support/
> 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 Guacamole 1.2.0 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 1.2.0 to make an successful RDP
> connection.
> Modify Group Policy
> 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)
>
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