FTP Slowness

Macs ftp upload/download very slow to Windows 2000
Information Server 5.0 svc pack 3, internal and external
IP addresses, hardware firewall. No problem w/ PC’s.
This happens w/ Fetch and captain FTP on OS 9.2.2
and 10.2.5. The problem seems to be Mac related.
Passive / active same results. Even tried hooking
directly to the same pc ethernet connection on which i
tested the PC speed as well as an outside connection.
What is causing this?