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https://www.snort.org/rule_docs/1-491
https://seclists.org/snort/2010/q2/148
https://www.clearos.com/clearfoundation/social/community/solved-snort-rule-for-ftp-brute-force
https://www.experts-exchange.com/questions/20997104/SNORT-RULE-TO-DETECT-BRUTE-FORCE-IN-FTP-and-WRONG-AUTH-MORE-THAN-5-TIMES.html
http://manual-snort-org.s3-website-us-east-1.amazonaws.com/node36.html
https://mailing.unix.snort.narkive.com/cXyvYvIg/snort-users-snort-rule-and-ftp-server
https://forum.netgate.com/topic/13988/ftp-server-behind-pfsense1-2-2-and-snort
https://www.aldeid.com/wiki/Suricata-vs-snort/Test-cases/Multiple-failed-logins
https://github.com/eldondev/Snort/blob/master/rules/info.rules
https://books.google.de/books?id=ZI1sfn4eJ8oC&pg=PA319&lpg=PA319&dq=snort+failed+ftp+user+login
https://resources.infosecinstitute.com/snort-rules-workshop-part-one/
https://books.google.de/books?id=w20JN2kpaXQC&pg=PA263&lpg=PA263&dq=snort+failed+ftp+user+login
https://books.google.de/books?id=5p0bLNSm30kC&pg=PA146&lpg=PA146&dq=snort+failed+ftp+user+login