AuthOrder mod_auth_file.c
AuthUserFile /auth/passwd
RequireValidShell off
ScoreBoardFile /run/proftpd/scoreboard
AllowOverwrite  on
AllowStoreRestart On
AllowRetrieveRestart On
WtmpLog off
UseReverseDNS off
DefaultRoot ~
Maxclients 30
MaxClientsPerHost 5

<IfModule mod_tls.c>
  TLSEngine                               on
  TLSVerifyClient                         off
  TLSRenegotiate                          none
  TLSProtocol                             TLSv1.2 TLSv1.3
  TLSOptions                              NoSessionReuseRequired AllowClientRenegotiations
  TLSRequired                             on
</IfModule>

<IfModule mod_delay.c>
  DelayOnEvent FailedLogin 5s
  DelayTable /run/proftpd/proftpd.delay
</IfModule>

Include /etc/proftpd/custom.conf.d/