Comment 2 for bug 1630955

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Guillaume (e1msih) wrote :

Answer from castaglia (main proFTPD developer) :
Now, starting with MySQL 5.7, the "Backend" SQLAuthType will no longer work. The alternative is to start using the MD5/SHA1/SHA256 (or other) SQLAuthTypes provided by mod_sql_passwd.

Complete answer here :
https://forums.proftpd.org/smf/index.php?topic=12043.15

Basically, Backend SQLAuthType cannot work with MySQL >= 5.7.