hmm and on other ports flashfxp works perfectly normal? although the ports are closed by norton or are they not in the list?
very strange but i maý have found an answer to your problem
on the symantec website, read
here and
here . this what i found so far and may explain it, so its your decision to open it or keep it closed, but as long as you have installed all windows patches you shouldn'be in great danger.
hope that helped
Tribl