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[FTPD] Reverse lookup failure

[FTPD] Reverse lookup failure

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Detection Logic

alert any $EXTERNAL_NET any -> $HOME_NET any (msg:"[FTPD] Reverse lookup failure"; pcre: "/can't verify hostname
| gethostbyaddr/"; default_proto: tcp; default_dst_port: $FTP_PORT; classtype: not-suspicious; program: ftpd
| ftp
| FTP
| FTPD; sid:5000189; rev:6;)

Field Validations

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