Intermittent DNS errors. IP team not able to diagnose

[AJIOreliance]

Intermittent DNS errors showing up in GSC for our fashion portal www.AJIO.com. Our IP team doesn't find any issues at our end. Everytime i write to them, they come back saying 'DNS is resolving fine in all servers'.

How do we resolve this? Pl help

[Bigb06]

Take the first tool available http://dnscheck.pingdom.com/?domain=www.AJIO.com and it seems your domain have errors.

[StephanSolomonidis]

There are a few issues with the DNS that I can see. First off, the email address in the SOA record is wrongly formatted, so won't receive mail. While that isn't the source of your issue, your IT people should change it so that they can receive messages about the DNS. Change this:

jliodns.admins@ril.com.

to this:

jliodns\admins.ril.com.

(Copy all of that exactly, including the dot at the end of the line.)

Secondly, there are different SOA serial numbers available. There are four nameservers for ajio.com, and they are ns1.ajio.com, ns2.ajio.com, ns3.ajio.com, and ns4.ajio.com. When I query ns1, ns2, or ns4, I get back a line like this:

ajio.com. 3600 IN SOA ns1.ajio.com. jiodns.admins@ril.com. 2016052708 10800 900 1209600 86400

But from ns3 I get this line:

ajio.com. 3600 IN SOA ns1.ajio.com. jiodns.admins@ril.com. 2016041301 10800 900 1209600 86400

The difference is the serial number (the bit after ril.com.): it's 2016052708 in the first case, and 2016041301 in the second. These numbers should always be the same. It looks from this line as though the ns3 nameserver should be fetching the newer serial number every 10800 seconds, yet it clearly isn't because it has a serial number from April 2016, while the other three nameservers have a serial number from May 2016. That's still not enough to explain your issue, but basically, your IT team need to investigate the performance of their nameservers, because this may be the symptom of a wider issue.

Good places for them to start are here and here. The first of those two links is the Pingdom test that Nicolas linked to, but with the important difference that it's checking ajio.com, rather than www.ajio.com.