Hi!
This is happening because Flexilis is likely blocking RedFly, because it's seeing weird traffic come in from redfly on non standard ports. I'm going to submit this to our dev team to take a look at to see if this can be resolved soon in a future release.
Until then, one possible workaround would be to turn off attack protection in the software for now, until the issue is resolved. If you have any other questions, etc, feel free to shoot us an email at support.at.flexilis.dot.com and we'll be happy to help!
-Chris,
Community Director, Flexilis
http://beta.flexilis.com
http://twitter.com/flexilis