Is your account real or demo? Because, you have to suppress PIN code verification for your live accounts, otherwise, the authentication fails. On how to do this, please follow this link: https://www.dukascopy.com/wiki/en/forex-cfds/jforex/practices
Suppress PIN code verification for LIVE accounts It is possible to disable PIN code verification upon login. You require a static IP address (contact your internet service provider). To register the IP address:
Login into your live trading platform.
Open the My Account report (Go to Account > My Account).
In Security Settings, click on IP registration and register your IP address.