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Check file */etc/nsswitch.conf*
Line started with hosts: should be like:
hosts: files dns
There is not enough information in your post to make any reasonable guess. I suggest you provide more details, such as, examples, content of your /etc/resolv.conf (which could be configured incorrectly), and last not least your OS distribution version. Can you reproduce the issue on another machine? Do you have your default domain suffix configured correctly. As a last resort you can also look at the log file of the DNS server to find out what was actually queried.
The error was with the DNS services being used