[Zope] Zope server cant bind port 80

Hi, When starting Zope server on port 80 under user "zope", sever fails with message "fail to bind port 80 - dont have permissions." When running under user "root", it is ok. When trying start zope server on port 8080, everything is ok. So just cant run on port 80 because of permissions but why? Have anyone similar experience? Zope server 2.5.1b1 FreeBSD 4.4 Thanks, David Marko