--- fail2ban-0.11.1.orig/config/filter.d/roundcube-auth.conf
+++ fail2ban-0.11.1/config/filter.d/roundcube-auth.conf
@@ -18,7 +18,7 @@ prefregex = ^\s*(\[\])?(%(__hostname)s\s
 failregex = ^(?:FAILED login|Login failed) for <F-USER>.*</F-USER> from <HOST>(?:(?:\([^\)]*\))?\. (?:(?! from ).)*(?: user=(?P=user))? in \S+\.php on line \d+ \(\S+ \S+\))?$
             ^(?:<[\w]+> )?Failed login for <F-USER>.*</F-USER> from <HOST> in session \w+( \(error: \d\))?$
 
-ignoreregex = 
+ignoreregex = Could not connect to .* Connection refused
 
 journalmatch = SYSLOG_IDENTIFIER=roundcube