id summary reporter owner description type status priority component resolution keywords cc component_version os os_version 12673 Win7 / Win10 connection Marc Gourmon "I'm using FileZilLa client 3.58 on a Win10 Pro workstation to connect to a Sony Deck Recorder through FTP Protocol. The connection is successful but when I tried to download or Upload a file it's says ""421 1 users (the maximum) are already logged in"" and follow ""could not connect to the server"" When I'm doing the same thing while using or old Win 7 workstation with FileZilla 2.2.27 all went well. All the firewall are off on both workstation. Is there any services you're aware of which could block the connection ? " Bug report closed high FileZilla Client rejected 421 1 users 3.58 Windows Windows 10 Pro /21H1 / OS build 19044.1566