How do I link TradeNavigator to my IBKR account?

Connection of any 3rd party software application to the TWS API first requires that the API setting within TWS has been enabled (see link for directions). If after enabling, you are still unable to connect you would need to contact the vendor's technical support group for assistance with their software:

Email: support@tradenavigator.com

Phone: (719) 284-1616

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What options are available for 3rd party applications that aren't compatible with IBKR's linked account structure?
Does your software offer backtesting of custom algorithms?