Cannot remotely connect to Zorin 18X through RDP

General Help
1

i am trying to remotely connect to Zorin, which is run as a VM on my Proxmox server, but it doesn't work
I am using Guacamole for my remote connection and the protocol is RDP port 3389
I am getting the message that Guacamole is unable to reach the RDP server.

I am using Zorin-OS-18.1-Core-64-bit

Under settings/ systems / remote desktop / i have this settings:

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image1318×1219 99.7 KB

Is there something else i need to do on my Zorin desktop to make it work?

2

Hello and welcome,
Did you activate your firewall ?
Did you try to ping your Proxmox server ?

3

Yes i activate my firewall and from a terminal i can ping to other servers

4

And did you try to disable firewall and connect ?
or doing this

sudo ufw allow 3389/udp
sudo ufw allow 3389/tcp
5

It did not work. I still cannot connect through Guacamole

6

Did a Mojeek search, then used the option to use Brave search engine, usin Ubuntu 24.04 in search criteria as that is what Zorin is based on:

Brave A.I. result gives:

To remotely connect to Ubuntu 24.04 using Apache Guacamole, you must first install XRDP on the Ubuntu machine, as Guacamole acts as a gateway for RDP, SSH, and VNC protocols rather than a direct desktop manager. The most common issue users face is connecting via NLA (Network Level Authentication) , which is often incompatible with Guacamole’s RDP implementation on Linux; therefore, you must set the Security Mode to Any in the Guacamole connection settings.

Here is the concise setup process:

  1. Install XRDP on Ubuntu : If using Ubuntu Server, install the XFCE desktop environment and XRDP:
sudo apt-get update
sudo apt-get install -y xfce4 xfce4-session xrdp
sudo adduser xrdp ssl-cert
echo xfce4-session >~/.xsession
sudo systemctl restart xrdp

If using Ubuntu Desktop, ensure Remote Desktop is enabled in Settings and the user is not currently logged in locally.

  1. Configure Guacamole :
  • Log into the Guacamole web interface.
  • Create a new connection for the Ubuntu machine.
  • Set the Protocol to RDP .
  • Enter the Ubuntu machine's IP address and port 3389 .
  • Crucial : Set the Security Mode to Any to bypass NLA errors.
  • Enter the valid Ubuntu username and password.
  1. Firewall and Connectivity : Ensure port 3389 is open in the Ubuntu firewall (sudo ufw allow 3389/tcp ) and that the Guacamole server can reach the Ubuntu machine over the network.

Note : Users have reported that Ubuntu 24.04 contains bugs related to RDP and graphics pipelines with certain versions of Guacamole. If connection issues persist, consider using VNC with XFCE instead, or downgrading to Ubuntu 22.04 for stability.

AI-generated answer. Please verify critical facts."