[issue821862] ftplib: Strict RFC 959 (telnet in command channel)

[Oleg Broytmann]

Oleg Broytmann <phd at phd.pp.ru> added the comment:

Since I've created the issue I found there are different servers even in
Unix. ProFTPd (and, I believe wu-ftpd) strictly implement
telnet-in-command channel, they even don't have an option to turn it
off. PureFTPd doesn't implement it.

On the client side - lftp (command line client) and squid (well-known
web/ftp proxy) implement telnet-in-command channel.

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nosy: +ods

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