This looks like either your desktop PC does *not* have the IP 192.168.15.2 (I just copied that from what you wrote, since I thought you know best, but check on your desktop with "ip addr") - or a VNC server (Xvnc or x11vnc) is not running, or not on port 5901 (":1"), or you have a firewall on your desktop or your VNC server does not listen on all interfaces.
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