The GuildFTPd has an option to Allow Hammering.
The Hammering option allows the GuildFTPd to apply auto ban options to the
Users and Groups. The system will ban an IP if it tries to send through to
many connections to fast. Once it starts banning IPs, GuildFTP becomes slow and
doesn't respond anymore.
On the Amethyst server, set ftp to OFF.
Close the FTP server and start it again.
Now you should be able to get into the GuildFTP and set "Allow Hammering"
Also clear the Ban IP list.