Based on this file:
https://raw.githubusercontent.com/sebres/fail2ban/5561423be3b2d4636f5484183c3ad470fd326d06/fail2ban/tests/config/filter.d/zzz-sshd-obsolete-multiline.conf
This is set to nothing it appears:
mdre-normal =

But then I see theses warnings: 

fail2ban-client[3646]: ERROR  NOK: ("No 'host' group in '<mdre-<mode>>’",
2017-07-05 11:29:56,218 fail2ban.filter         [3653]: WARNING Mutliline regex 
set for jail '%s' but maxlines not greater than 1
2017-07-05 11:29:56,228 fail2ban.filter         [3653]: ERROR   No 'host' group 
in '<mdre-<mode>>'
2017-07-05 11:29:56,228 fail2ban.transmitter    [3653]: WARNING Command ['set', 
'sshd', 'addfailregex', '<mdre-<mode>>'] has failed. Received 
RegexException("No 'host' group in '<mdre-<mode>>'",)

Is that OK? We have been seeing a lot of missed bans as mentioned in this 
thread: https://github.com/fail2ban/fail2ban/issues/1719 so we’d like to have 
the latest working correctly.





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