Cant remotely access my VNC Server ..

Cant remotely access my VNC Server ..

Ive installed a TightVNC server .. and it accepts connections on port
12589 instead of 5900 with authentication .. On my Local LAN of class A
private address .. I can access my VNC server running machine with the
java viewer .. and remote desktop works fine locally!
But I cant connect on the same port number on my public IP address
assigned to my WiFi router .. I have a DSL connection .. and ive even
forwarded the port 12589 to my 10.x.x.x static IP in Netgear WGR614v10
(tried all 3 protocols: UDP/TCP/both(any))
Online open port checker programs too report the port is closed!
Even with Disabling antivirus and firewall , I couldn't remote desktop ..
Is there anything more can be done ..