On the off chance that someone will know what's going on here...
I'm trying to FTP a file to a server. At my console on helpdesk.tblc.org, I see this:
> ftp 128.222.117.50
Connected to 128.222.117.50.
[pause]
421 Service not available, remote server has closed connection
And here's what tcpdump sees:
(
tcpdump -vv makes really long output lines... )