There are no "defined" PASSIVE ports (to my knowledge) but I've been using the following ports under PureFTPD for several years without any issues:
PassivePortRange 60000 65500
That will basically allow the FTP daemon and client to open a port between 60000 and 65500 which should be more than enough for even a busy FTP server. Also, if you have a firewall don't forget to open the port range or they will not work.
I believe that RFC 959 just mentions a high numbered port, which would be 1025-65535 for both ends of the data connection.
-Mark Adams www.bitserve.com - Secure Michigan web hosting for your business.
Only host still offering a full money back uptime guarantee and prorated refunds.
Offering advanced server management and security incident response!