Article ID: 111616, created on Feb 6, 2014, last review on May 10, 2014

  • Applies to:
  • Plesk

Sintomi

Ci sono diversi errori nel maillog:

/usr/local/psa/var/log/maillog
---8<---
Jul 11 13:28:31 plesk qmail: 1310365711.275186) 1513: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:29:34 plesk qmail: 1310365774.101285) 1514: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:31:31 plesk qmail: 1310365891.566901) 1517: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:31:36 plesk qmail: 1310365896.567026) 1518: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:31:39 plesk qmail: 1310365899.566991) 1519: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:33:01 plesk qmail: 1310365981.655523) 1520: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:33:11 plesk qmail: 1310365991.655422) 1522: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:33:20 plesk qmail: 1310366000.656378 delivery 1521: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:35:17 plesk qmail: 1310366117.655338 delivery 1523: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
Jul 11 13:41:41 plesk qmail: 1310366501.871498 delivery 1533: deferral: CNAME_lookup_failed_temporarily._(#4.4.3)/
--->8---

Causa

I server DNS remoti, specificati in /etc/resolv.conf, non possono essere richiesti via TCP (come QMail cerca di fare):

~# host -T -tMX DOMAIN.TLD
;; Connection to NNN.NNN.NNN.NNN1#53(NNN.NNN.NNN.NNN1) for DOMAIN.TLD failed: connection refused.
;; Connection to NNN.NNN.NNN.NNN1#53(NNN.NNN.NNN.NNN1) for DOMAIN.TLD failed: connection refused.
;; connection timed out; no servers could be reached
~#
~# host -tCNAME DOMAIN.TLD
DOMAIN.TLD has no CNAME record
~#


NNN.NNN.NNN.NNNX denota i server di nomi remoti configurati in /etc/resolve.conf:

~# cat /etc/resolv.conf
search plesk.hostname
nameserver NNN.NNN.NNN.NNN1
nameserver NNN.NNN.NNN.NNN2
...

Risoluzione

Per risolvere questo problema, controlla che tutti i server DNS rispondano alle query DNS TCP:

# host -tCNAME parallels.com NNN.NNN.NNN.NNN1
;; connection timed out; no servers could be reached
# host -tCNAME parallels.com NNN.NNN.NNN.NNN2
;; connection timed out; no servers could be reached
...


Se il risultato non è positivo come nell'esempio sopra, evita che vengano mostrati nel file /etc/resolve.conf , ma accertati che almeno un server DNS sia perfettamente funzionante lì.

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