Official forums for BZFlag.org

im playing on Missile War 2.3 and 15 seconds after i spawn it comes up and says "ur UDP dosent match the one in game. please upgrade ur client at blahblahblah.org.
Try another server." WAT DOES THIS MEAN! this is my favourite map and idk wat is rong.... HELP!!!!

If it happened once, don't worry about it. If it keeps happening, then try the stuff at that link.