Error MAC OS Agent

   I have installed MAC Os Agent on MAC OS X (10.3.9), it seems that agent in installed correctly, but when I try to select MAC appears this mesage "error tryin to connect to MAC.local, server has denied connection or has reached maxim numer connection"

I don't know if it is a prolbem of MAC agent or media server(is a windows 2000 SP4)

What can I do?

thanks