A user reported he was unable to connect to a Microsoft Windows 8 system functioning as a VNC server using UltraVNC. The remote vncviewer program was reporting "Failed to connect to server !" I logged into the system and verified that the system was listening on the registered port for VNC, port 5900 using the netstat command.
C:\Users\Collen>netstat -a | find "5900" TCP 0.0.0.0:5900 Speleologist:0 LISTENING C:\Users\Collen>
I used windump, a free packet capture tool for Microsoft Windows systems, similar to the tcpdump tool found on OS X/macOS and Linux systems, to verify that the system was seeing the incoming connections to network port 5900.
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