Cannot access webmail: ERR_NAME_NOT_RESOLVED

Created:

2017-08-09 14:02:44 UTC

Modified:

2017-08-15 05:27:19 UTC

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Cannot access webmail: ERR_NAME_NOT_RESOLVED

Symptoms

1. Webmail.example.com is not accessible with the following error in a browser:

This site can't be reached
webmail.example.com's server DNS address could not be found.
ERR_NAME_NOT_RESOLVED

2. When trying to resolve webmail.example.com the following output is shown:

# dig webmail.example.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> webmail.example.com
;; global options: +cmd
;; Got answer:
;; - >>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 35191
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;webmail.example.com. IN A
;; AUTHORITY SECTION:
example.com. 231 IN SOA ns03.exampledns.com. dns.example.net. 2017031700 28800 7200 604800 600
;; Query time: 0 msec
;; SERVER: 192.0.2.2#53(192.0.2.2)
;; WHEN: Wed Aug 9 20:36:56 2017
;; MSG SIZE rcvd: 111

3. Non-Plesk DNS server is used for example.com DNS zone hosting:

# dig NS example.com
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.62.rc1.el6_9.2 <<>> NS example.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 60167
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 4
;; QUESTION SECTION:
;example.com. IN NS
;; ANSWER SECTION:
example.com. 3362 IN NS ns03.exampledns.com.
example.com. 3362 IN NS ns04.exampledns.com.
;; ADDITIONAL SECTION:
ns04.domaincontrol.com. 107611 IN A 203.0.113.2
ns03.domaincontrol.com. 109330 IN A 203.0.113.3
;; Query time: 1 msec
;; SERVER: 192.0.2.2#53(192.0.2.2)
;; WHEN: Wed Aug 9 21:22:34 2017
;; MSG SIZE rcvd: 175

Cause

Missing "A" record for webmail.example.com on external DNS server.

Resolution

Contact your DNS provider (registrar) in order to add the missing "A" record for webmail.example.com.

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