Guacamole 1.3.0 testing

Hi friends,

please test nethserver-guacamole providing Guacamole 1.3.0 (on a test machine if possible).

yum install

Epel provides libguac*-1.3.0 now so the module needed an update.

I included the guacamole-customize-loginscreen-extension by @Zer0Cool, thanks to @oneitonitram for his post, and adapted it a little bit. Still thinking about the design of the login page. This is the example actually included in the new module:

Here’s another example by @flatspin.

You can manage the content of /var/lib/guacamole/extensions/branding.jar easily with 7zip in Windows as @royceb explained here or with mc and unzip:

yum install mc unzip

After changes to the file you need to signal-event nethserver-guacamole-update to apply them.

See Guacamole docs for more info.
If you already use a branding.jar file, please do a backup before updating.

I have disconnecting issues with VNC on servers that were updated from version 0.9.* but didn’t find a solution yet. Similar to these:

Source code:


Early testing but the initial install works for me with the updated login page.

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I’ll make a snapshot / backup (PBS) of my NethServer at home and upgrade the Mesh on that box later afternoon today. I’ll provide feedback!

My 2 cents

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Hi Markus,

when just updating the login-page looks like this:


No prob. Did a snapshot before.
So I removed the neth-package and the guacamole-rpms manually.
After reinstall it works:

Don’t know if this happend because of the customization of the login-page .

The database with connections, users etc. still exists.
But I can’t open a remote session. :thinking:
It sticks on “waiting for response” when I try to connect to a Win10-machine.
Just a short try. Will play more with it later.
I think it not a problem of guacamole itself, more a networkproblem/Windowsproblem here.

So, great work Markus!! Thanks a lot for your effort on this!!! :+1: :smiley:

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It seems to be a problem of my Win10-clients.
With one client on Win10 2004 it works, with another client on Win 10 20H2 it doesn’t work???
But I can do a windowsremotedesktop from the Win10 2004 client to the Win 10 20H2 client.
So remotedesktop on the 20H2 client is working, but not guacamole.
Strange windows world…

EDIT: When I deactivate WOL in connection it works with the 20H2 client.

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Happy to report RDP with NLA enabled on a Windows 10 2004 works and prompts for the username & password field if left blank. Working on the new windowed app feature and will report back.


Thanks for testing!

I think so, it seems like a CSS error. Maybe there was an old jar from your previous login page configuration.

I am going to move old jars to a separate dir when the module is installed/configured to not have old jars in the extensions dir that may make problems.

Thanks for the hint, I’m going to reproduce it because I don’t understand the relation between Wake On Lan and RDP login. :thinking:

Happy to read that. :+1:

Thanks, looking forward to your report, never tested these windowed apps.

Thanks, I appreciate it.


I think to recall you could configure guacamole to make the server send a WOL packet to wake-up a specific computer and set a wait/delay for the computer to be up before effectively trying RDP connection.


I’m getting a 404 after upgrading.
All the services are running, but I noticed that guacd is running on 4822, while the apache conf is set on 8080:
[root@smart guacamole]# systemctl status guacd
● guacd.service - Guacamole proxy daemon
Loaded: loaded (/usr/lib/systemd/system/guacd.service; enabled; vendor preset: disabled)
Active: active (running) since Thu 2021-02-25 10:32:53 -03; 29min ago
Docs: man:guacd(8)
Main PID: 2043 (guacd)
Tasks: 1
CGroup: /system.slice/guacd.service
└─2043 /usr/sbin/guacd -f

Feb 25 10:32:53 smart.nethserver systemd[1]: Started Guacamole proxy daemon.
Feb 25 10:32:56 smart.nethserver guacd[2043]: Guacamole proxy daemon (guacd) version 1.3.0 started
Feb 25 10:32:56 smart.nethserver guacd[2043]: Listening on host, port 4822
Feb 25 10:32:56 smart.nethserver guacd[2043]: guacd[2043]: INFO: Guacamole proxy daemon (guacd) version 1.3.0 started
Feb 25 10:32:56 smart.nethserver guacd[2043]: guacd[2043]: INFO: Listening on host, port 4822
Hint: Some lines were ellipsized, use -l to show in full.
[root@smart guacamole]#


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@jfranco Thanks for testing!

Tomcat8 is serving guacamole and listens on port 8080.

Please check if Tomcat8 is running:

systemctl status tomcat8 -l

guacd is the daemon process to connect to remote RDP, VNC, etc, it listens on port 4822 by default.