TF2 Server - Only I can Join?

[Boosh3]

i can't seem to figure out why nobody else can join my server
lan is set to zero..

sv_lan 0

i forwarded the ports acording to http://www.portforward.com
i downloaded their tool to see if my ports are actually open, and they are
but still nobody can join my game?

please help this has been stumping me all day