This looks like the important bit:

Aug 28 11:09:23 guac guacd[775]: guacd[775]: INFO: RDP server closed/refused 
connection: Server refused connection (wrong security type?)
Aug 28 11:09:23 guac guacd[775]: RDP server closed/refused connection: Server 
refused connection (wrong security type?)

Could you take a look at the workstation's logs around that time and see if it 
gives any hints.  Something like this:

$ journalctl --since="2024-08-28 11:00"

The logs you posted are hinting at security type being the issue.  Double check 
the connection settings in the Tomcat web UI.

My laptop and desktop run Ubuntu so I'll give it a go myself tomorrow, if the 
helpdesk allows me some respite 8)

Cheers
Jon




On Wed, 2024-08-28 at 15:21 +0000, Randxm wrote:
I can RDP in with Remmina no problem. I can also SSH to this ubuntu workstation 
using Guac without issue. Attached is the debug log. I hope there is nothing in 
the logs that will doxx me. I appreciate the help on this. I have a few people 
that rely on this Guac server I've set up.
On Wednesday, August 28th, 2024 at 5:34 AM, Jon Gerdes <[email protected]> 
wrote:

On Tue, 2024-08-27 at 21:31 +0000, Randxm wrote:
Hello,

I'm having a very hard time figuring out how to get Guac to allow me to remote 
to an Ubuntu 24.04 desktop. I just installed 24.04 on a workstation and enabled 
desktop sharing and remote control. I see the username and password. I set all 
of this up in Guac but I keep getting the error "RDP server closed/refused 
connection: Server refused connection (wrong security type?)".

Within Guac my settings are fairly simple: Protocol RDP, hostname and port set, 
username and password set, security type set to Any, Disable authentication 
unchecked, and ignore server certificate checked. This exact config has worked 
for me with previous Ubuntu versions.

Can somebody point me in the right direction?




Are you able to connect using a generic RDP client such as mstsc.exe or 
xfreerdp?

Edit or create /etc/guacamole/guacd.conf:


[daemon]
log_level = debug

See 
https://guacamole.apache.org/doc/gug/configuring-guacamole.html#configuring-guacd
 for more details.

guacd uses syslog for logging so depending on your distro, you may have to hunt 
around for the output.  Try /var/log/syslog or messages first.

Let us know how you get on

Cheers
Jon


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