Are you behind a NAT? These are common on corporate/university networks. If not, try looking in your router to see if it has NAT (network address translation) enabled, and if it is, disable it.
The MTA team have no control over the servers, if you want to be unbanned I suggest you contact the owner of the server (if it's a clan server, try their forum).
You specify the gameport and adminport in the config file, by default the gameport is 22003 and the adminport is 44003, and the ASE reporting port is ALWAYS the gameport+123.
It isn't a bug, it's you being an idiot and downloading EVERY SINGLE MAP which is submitted to the center. 95% of the maps that people upload to there are utter crap.