[CentOS] BIND Log file entries

This morning I see this in the syslog on our primary public DNS host.

    internal_send: 142.77.1.1#33950: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#35153: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#35644: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#49394: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#49816: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#49929: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#50281: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#50453: Connection timed out: 1 Time(s)
    internal_send: 142.77.1.1#50534: Connection timed out: 1 Time(s)
. . . (x100s)

 dig -x 142.77.1.1

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> -x 142.77.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31154
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, ADDITIONAL: 3

;; QUESTION SECTION:
;1.1.77.142.in-addr.arpa.	IN	PTR

;; ANSWER SECTION:
1.1.77.142.in-addr.arpa. 604800	IN	PTR	ns.uunet.ca.

;; AUTHORITY SECTION:
77.142.in-addr.arpa.	86400	IN	NS	ns.uunet.ca.
77.142.in-addr.arpa.	86400	IN	NS	AUTH01.NS.UU.NET.
77.142.in-addr.arpa.	86400	IN	NS	NS2.uunet.ca.

;; ADDITIONAL SECTION:
AUTH01.NS.UU.NET.	167	IN	A	198.6.1.81
ns.uunet.ca.		86400	IN	A	142.77.1.1
NS2.uunet.ca.		86400	IN	A	142.77.1.5

;; Query time: 114 msec
;; SERVER: 216.185.71.33#53(216.185.71.33)
;; WHEN: Thu May  1 09:59:50 2014
;; MSG SIZE  rcvd: 176



What is this and why is it happening?

-- 
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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
Harte & Lyne Limited          http://www.harte-lyne.ca
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