BitComet requires you to be able to receive incoming connections. If
you're behind a NAT router but don't
have port forwarding configured properly, incoming connections will be
stopped by your router (won't get to your computer).You need to configure port forwarding, so your router knows
that the incoming connections are for BitComet and will be allowed
through (= forwarded) to your computer.
There are several versions of your router:
, scroll (almost all the way down) and find your router model.
On the next page, skip the advertisement (upper right corner) and look for BitComet.
Simply follow the instructions on that page - they are precise and correct.
In general: You can use ANY port, but I would prefer a listen port between 49152 and 65534 because they're classed as "Dynamic and/or Private Ports" by IANA,
so nothing else should be using them by default and they're not the
standard ones blocked by ISP's or trackers, but - as I said - you can enter any other
port you wish.
If you have any more questions, just come back and let me know - I'm happy to help.
Good luck & thanks for rating!