--- fail2ban/server/ipdns.py.orig	2017-08-09 14:53:05 UTC

+++ fail2ban/server/ipdns.py

@@ -69,10 +69,14 @@ class DNSUtils:

 		for fam, ipfam in ((socket.AF_INET, IPAddr.FAM_IPv4), (socket.AF_INET6, IPAddr.FAM_IPv6)):

 			try:

 				for result in socket.getaddrinfo(dns, None, fam, 0, socket.IPPROTO_TCP):

-					ip = IPAddr(result[4][0], ipfam)

+					# if getaddrinfo returns something unexpected:

+					if len(result) < 4 or not len(result[4]): continue

+					# be sure we have an ip-string

+					# some return an integer there

+					ip = IPAddr(str(result[4][0]), ipfam)

 					if ip.isValid:

 						ips.append(ip)

-			except socket.error as e:

+			except Exception as e:

 				saveerr = e

 		if not ips and saveerr:

 			logSys.warning("Unable to find a corresponding IP address for %s: %s", dns, saveerr)