Traffic on loopback adapter failures

Help with Setup/Upgrade
1

For some reason the traffic started to fail in loopback, aka lo interface so IPv4 127.0.0.1 and IPv6 ::1 addresses.

root@box:~# nslookup localhost localhost
;; communications error to ::1#53: connection refused
;; communications error to ::1#53: connection refused
;; communications error to ::1#53: connection refused
Server:		localhost
Address:	127.0.0.1#53

Name:	localhost
Address: 127.0.0.1
;; communications error to ::1#53: connection refused
;; communications error to ::1#53: connection refused
;; communications error to ::1#53: connection refused
Name:	localhost
Address: ::1
root@box:~# netstat -tulpn|fgrep ':53 '
tcp        0      0 ip4.address:53          0.0.0.0:*               LISTEN      654/nsd             
tcp        0      0 127.0.0.1:53            0.0.0.0:*               LISTEN      717/named           
tcp        0      0 127.0.0.1:53            0.0.0.0:*               LISTEN      717/named           
tcp6       0      0 IPv6:add:ress::::::::53 :::*                    LISTEN      654/nsd             
udp        0      0 37.27.16.30:53          0.0.0.0:*                           654/nsd             
udp        0      0 127.0.0.1:53            0.0.0.0:*                           717/named           
udp        0      0 127.0.0.1:53            0.0.0.0:*                           717/named           
udp6       0      0 IPv6:add:ress::::::::53 :::*                                654/nsd             
root@box:~#

Because name lookups fail, mail is rejected.

2

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