Screen sharing using VNC across the Internet

I have my computer set up with no-ip.Com and I can ping the machine at the hostname. I turned on screen sharing in the control panel with the settings: I'll allow access for all users, computers settings: anyone can request to control the computer checked, and VPN users can connect with a password. I also went to my Apple Airport utility and added the Apple remote desktop service in the port mapping, which opens port 5900, the screen sharing port.
When I try to connect to the host name using the screen sharing client, it attempts to connect, but fails after five seconds.
Any help would be greatly appreciated

to see if port 5900 is open use your terminal with the following command (this test should be done from outside your network)
nc your-no-ip-serveraddress 5900
I would also recommend a much more secure way to do this.
Turn on remote login. then open tcp port 22 from your router to your mac.
Then use the terminal from your remote mac
ssh -L 5901:localhost:5900 your-no-ip-serveraddress
once the tunnel is established in the screensharing app use a host address of localhost:5901

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Screen sharing using VNC across the Internet

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