A record not working

Hi all,

On a single domain among many the A record for www doesn't work at all.
I deleted and added again the record (usually resolves straight away) again, restarted bind and no luck.
It always says server can't find the www.mydomain.com while mydomain.com resolves fine.

This is very bizarre, never seen it before. Any ideas how to troubleshoot this?
This is on a multi server setup with master/slave servers dedicated for DNS.

 

intodns shows same as when I do a nslookup (WWW A Record ERROR: I could not get any A records for www.mydomain.com).
Where are stored the bind zone files as under /etc/bind/ there are many files. Is it the one that ends up .signed?

 

Under .signed it is the A record for www. Below I paste the whole file (I've just replaced the domains and IPs)

$TTL 3600
@ IN SOA dns1.mycompany.com. admin.mycompany.com. (
2023042007 ; serial, todays date + todays serial #
7200 ; refresh, seconds
540 ; retry, seconds
604800 ; expire, seconds
3600 ) ; minimum, seconds
;

mydomain.com. 3600 A 1.1.1.1
www 3600 A 1.1.1.1
mydomain.com. 3600 AAAA 1.1.1.1
www 3600 AAAA 1.1.1.1
mydomain.com. 3600 DNAME smtpsign._domainkey.mydomain.com
mydomain.com. 3600 CAA 0 issue "letsencrypt.org"
mydomain.com. 3600 MX 10 email1.mycompany.com.
mydomain.com. 3600 NS dns1.mycompany.com.
mydomain.com. 3600 NS dns2.mycompany.com.
mydomain.com. 3600 TXT "v=spf1 mx a ~all"


$INCLUDE /etc/bind/Kmydomain.com.+007+00362.key

$INCLUDE /etc/bind/Kmydomain.com.+007+40221.key

 

Found it, it was a dname record wrong and was somehow conflict with A record.

 

It's often most efficient to debug such errors with named-checkzone just run it like this:

named-checkzone /etc/bind/mydomain.tld.zone mydomain.tld

and it will tell you if the zonefile contains any errors and will not be loaded.