CC uses 2 different ports, depends on how (Wireless device connection | Content server) you connect. 9090 | 8080 are Calibre defaults.
Did you try the things from the CC FAQ?
http://faq.calibrecompanion.co/
Wireless / remote connections have many players in between. It only takes one balking to gum up the works (and that is just for a LAN type connect. Try from outside that: OMG) .