I'm running a virtual Machine on VirtualBox 6.0.24. The VM is running Ubuntu 20.04. If I run the VM on my Windows 10 host, I can connect to the Ubuntu guest OS via both SSH and RDP.
I then copy the VM to my Debian 10.6.0 host machine and spin it up. Here I can connect to it via SSH, but when trying RDP, I get connection reset by peer. I have tried connecting both locally on the Host and from over my network. Same result.
The Debian extension pack for Virtual box is installed on the Host and matches the virtual box guest addons installed on the Guest, if version matching matters here.
There is nothing the syslog to give any clue to an issue. It's the same VM, unaltered between Host machines. There is no firewall running on the Debian Host. Running to command
sudo lsof -i -P -n | grep LISTEN gives the following result. NB: On the host OS the RDP port is set to 33890. This is mapped to 3389 in the VM settings file. This worked OK on the Windows host.
cupsd 796 root 6u IPv6 13466 0t0 TCP [::1]:631 (LISTEN) cupsd 796 root 7u IPv4 13467 0t0 TCP 127.0.0.1:631 (LISTEN) sshd 847 root 3u IPv4 20851 0t0 TCP *:22 (LISTEN) sshd 847 root 4u IPv6 20853 0t0 TCP *:22 (LISTEN) VBoxHeadl 2296 root 19u IPv6 394646 0t0 TCP *:33890 (LISTEN) VBoxHeadl 2296 root 22u IPv4 382556 0t0 TCP *:33890 (LISTEN) VBoxHeadl 2296 root 23u IPv4 382557 0t0 TCP *:222 (LISTEN)
I'm at a loss what to try so any suggestions are gratefully received.