DNS names are not resolved externally over UDP

Created:

2016-11-16 12:46:17 UTC

Modified:

2017-08-11 22:08:46 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
    203.0.113.2

    [root@remoteserver]# dig +short @pleskserver_IP example.com
    ;; connection timed out; no servers could be reached
  2. Domain can be resolved over TCP from external server:

    [root@remoteserver]# dig +short +tcp @pleskserver_IP example.com
    203.0.113.2
  3. Firewall is turned off on a server

Cause

Connections to UDP port 53 are filtered by an intermediary host

Resolution

Contact network administrator or Internet Service Provider for assistance

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