This error you usually find while you try to check your dns server records with nslookup, if you hit nslookup on cmd.
In most cases it happens because of incomplete ending of PTR record of BIND server. So first open reverse lookup zone and check it. if you mis "." followed by name of your dns server in PTR record, simple do it and reload the zone,
$TTL 1D
@ IN SOA ns.geekinlinux.com. root.ns.geekinlinux.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
@ IN NS ns.geekinlinux.com.
ns IN A 192.168.20.121
121 IN PTR ns.
that's it.
In most cases it happens because of incomplete ending of PTR record of BIND server. So first open reverse lookup zone and check it. if you mis "." followed by name of your dns server in PTR record, simple do it and reload the zone,
$TTL 1D
@ IN SOA ns.geekinlinux.com. root.ns.geekinlinux.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
@ IN NS ns.geekinlinux.com.
ns IN A 192.168.20.121
121 IN PTR ns.
that's it.
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