220 (vsFTPd 2.2.2)

220 ProFTPD Server ready.

220 (vsFTPd 3.0.5)

220 ProFTPD 1.3.3g Server (NETGEAR ReadyNAS) [192.168.1.100]
500 GET not understood
500 HOST: not understood
500 USER-AGENT: not understood

220 ProFTPD 1.3.3g Server (NETGEAR ReadyNAS) [192.168.1.100]
500 GET not understood
500 HOST: not understood
500 USER-AGENT: not understood
550 */*: Forbidden command argument
500 CONNECTION: not understood
500 Invalid command: try being more creative

220 ProFTPD 1.3.4b Server (AGUSTINSVR) [192.168.1.18]
500 GET not understood
500 HOST: not understood
500 USER-AGENT: not understood

220 ProFTPD 1.3.4b Server (AGUSTINSVR) [192.168.1.18]
500 GET not understood
500 HOST: not understood
500 USER-AGENT: not understood
500 ACCEPT: not understood
500 CONNECTION: not understood
500 Invalid command: try being more creative