ERROR: rdr.IOException: java.net.SocketException: Connection reset

[L.M.]

Hello,

May I ask you for help?

- I am using "VNC Server Free Edition for Win32, Version 4.1.2"

- I launch the server on a host which IP address is 192.168.0.6

- My router, which has a public address W.X.Y.Z,
  is configured so that everything it receives on its ports 5800 and 5900
  is redirected to that 192.168.0.6 host.

- Someone else, types in its Web browser: http://W.X.Y.Z:5800/
  to connect to the 192.168.0.6 host VNC server.

- After, say 3 minutes, that "someone else" receives the following message:
  "rdr.IOException: java.net.SocketException: Connection reset"
  The error can be repeated.

Can you help me fix that?

Thanks in advance,

--
Leon