I'm not sure that we have enough information to answer
your question, but I'll give it a go:
I'm assuming that:
1) The machine is connected to the internet,
2) you have Microsoft Internet Explorer open and can view
web sites, and
3) you are typing "ftp://999.999.999.999" in the address
bar (where the nines are replaced by the actual ip address
of the server you are trying to reach.
Try this first: Click the Tools menu, then Options, then
the Advanced tab of the dialog box that appears. Scroll
down a little until you see "Use Passive FTP (for firewall
and DSL modem compatibility)". If it's checked, uncheck
it. If it's not checked, put a checkmark in it. Then
give it a try again and report back here.
If this doesn't help, then we need to know more about your
network configuration, including how you are connecting,
TCP/IP configuration, everything.
David Dickinson
eveningstar at mvps dot org
(Please reply only to this group)