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utm reverseproxy - DNSRBL query failed

Hallo,

in meinem WAF Log stehe öfter Meldungen dieser Art:

2014:06:01-20:56:52 utm reverseproxy: 
[Sun Jun 01 20:56:52.184690 2014] 
[authz_blacklist:error] 
[pid 8997:tid 3726900080] (97)Address family not supported by protocol: [client fe80::f2a2:25ff:fea3:3c13:33148] DNSRBL query failed 

Ist schon klar, IPv6 fe80 Adressen sind link local, aber warum fragt die UTM diese in einer DNSRBL ab?
Denke die Abfragen kommen aus dem Gast WLAN von einem iPhone, wenn jemand OWA aufruft

Wie kann ich die DNSRBL Abfrage unterbinden ?

Gruss Gunnar


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