DNS names are not resolved externally over UDP

Refers to:

  • Plesk 12.5 for Linux
  • Plesk 12.0 for Linux

Created:

2016-11-16 12:46:17 UTC

Modified:

2016-12-21 19:10:26 UTC

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DNS names are not resolved externally over UDP

Symptoms

  1. Website is resolved internally, but cannot be resolved from external locations:

    [root@pleskserver]# dig +short @pleskserver_IP example.com
    10.10.10.10

    [root@remoteserver]# dig +short @pleskserver_IP example.com
    ;; connection timed out; no servers could be reached
  2. DNS resolution over TCP is possible externally:

    [root@remoteserver]# dig +short +tcp @pleskserver_IP example.com
    10.10.10.10
  3. iptables is turned off

Cause

Connections to UDP port 53 are filtered by an intermediary host

Resolution

Contact network administrator regarding the issue.

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