Performing a DNS lookup with dig results in this answer:

Question

Firew Abebe · Accepted Answer

There is no . after linuserv.example.net in the PTR record in the reverse lookup zone file

Firew Abebe · Answer

There is no . after linuserv.example.net in the PTR record in the forward lookup zone file

Firew Abebe · Answer

There is no . after linuserv in the PTR record in the forward lookup zone file

Firew Abebe · Answer

The . in the NS definition in the reverse lookup zone has to be removed

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