The first thing you should check is whether Lookout Protocol Driver has configured the COM port for remote connections. Select Options>>Serial Ports in Lookout. Select Dial-Up for a modem connection or Radio for a radio modem connection then click Accept.
If that doesn't solve the problem, please contact NI Technical support at www.ni.com/ask and select "E-mail NI" as a communication method so we can help you troubleshooting this issue.
Regards,
Cyril Bouton
Applications Engineer
Nationla Instruments
Cyril Bouton
Active LabVIEW Developper