bug NAT redirection daisy chain java port 5801 > 5800

[redge]

internet NAT 5801 > 5800 ... winvnc http redirect to 5900 fail double redirect
internet NAT 5901 > 5900 ... ok via vncviewer (single redirect)

I have the router set to forward port 5901 to port 5900 at 192.168.40.40 and also set to forward port 5902 to port 5900 at 192.168.40.41 so I can connect to both computers externally. This works,

however

For the JAVA part, I also have port 5801 forwarded to port 5800 at 192.168.40.40 and port 5802 forwarded to port 5800 at 192.168.40.41

on web browser
http://myhost.dyndns.org:5801

result:
Network error: could not connect to server: myhost.dyndns.org:5900

verified, fail for my web browser too

happen on all version of winvnc where no single port sharing http+rfb

solution update of winvnc:
single port sharing http+rfb
or
rewrite internal
internet NAT 5801 > 5800 redirect to 5900 -->5800 send back to --> 5801
java network forget to remember the route NAT packet