nmap looks like a complicated beast.Instead of ping/ssh, try to run nmap from the terminal. If vnc shows up in the list, you must have mistyped the address or your client is broken.
nmap -sT -p T:5900 192.168.1.0/24
Seems to do the job, reporting: 5900/tcp open vnc even when there is no active connection.
Interestingly 5900/udp is closed but at least one VNC client (RealVNC) does use UDP as well as TCP.
Statistics: Posted by PDM1950 — Fri Jan 16, 2026 6:43 pm