Wing FTP Software

I have set a domain to dyndns type external IP and set a passive range of 22222 - 22250 (28 ports).

However on clicking the OK button the range changes from to 22222 - 22231

How come? why can't I increase the passive range?

thanks
Rim

Please uncheck the option "Auto-forwarding passive port to router as outlined below", then forward those passive ports in your router manually.