Connect with an ipad 2 over 3g

[crop]

Hello, sorry for my english, i'm french, i'll try to explain my problem :
i bought an ipad 2, on wifi, i can reach my imac perfectly, when i try to reach my imac with the real ip, i have the always same error :
Host 'XX.XXX.XXX.XXX' Port : 5900
Access Denied.
The VNC server didn't accept the supplied credentials.

I already open the 5900 port on my router, and i also test the same thing with another VNC app on my iphone 4 and it work over 3g.
Anyone have an idea?
Thank you for your answer.

[raf]

The error means that your username/password are not accepted by the Mac. Please try re-entering them. You can also try creating a whole new session, just to make sure all the settings are entered correctly.

Raf.

[crop]

okay! after a few try, i found the problem, i must leave the username blank, and it run now, thank you very much for helping

[raf]

okay! after a few try, i found the problem, i must leave the username blank, and it run now, thank you very much for helping

Thanks crop, for letting me know you got it working!

Raf.