fails:Net::FTP#connect tries to connect to the FTP Server on the given host and port
fails:Net::FTP#connect returns nil
fails:Net::FTP#connect prints a small debug line when in debug mode
fails:Net::FTP#connect does not raise any error when the response code is 220
fails:Net::FTP#connect raises a Net::FTPReplyError when the response code is 120
fails:Net::FTP#connect raises a Net::FTPTempError when the response code is 421
