04:26:46dab@dabpc:~$ dig de.wikipedia.org @ns2.wikimedia.org

; <<>> DiG 9.7.3 <<>> de.wikipedia.org @ns2.wikimedia.org
;; global options: +cmd
;; connection timed out; no servers could be reached

04:27:13dab@dabpc:~$ dig de.wikipedia.org @ns1.wikimedia.org

; <<>> DiG 9.7.3 <<>> de.wikipedia.org @ns1.wikimedia.org
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21129
;; flags: qr aa rd; QUERY: 1, ANSWER: 3, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;de.wikipedia.org. IN A

;; ANSWER SECTION:
de.wikipedia.org. 3600 IN CNAME wikipedia-lb.wikimedia.org.
wikipedia-lb.wikimedia.org. 600 IN CNAME wikipedia-lb.esams.wikimedia.org.
wikipedia-lb.esams.wikimedia.org. 3600 IN A 91.198.174.225

;; Query time: 184 msec
;; SERVER: 208.80.152.142#53(208.80.152.142)
;; WHEN: Sun Oct 16 04:27:20 2011
;; MSG SIZE rcvd: 120

Noticed it because the TS could not longer resolve internal IPs.

Version: unspecified
Severity: major