Why "hostname" is not working in "from" directive in authorized_keys file?

Solution Unverified - Updated -

Issue

  • Hostname is not working in "from" directive in authorized_keys file for some ssh versions. Only ip address is working for "from" directive.
  • After configuring hostname in "from" directive, getting following messages in /var/log/secure:
 sshd[xxxxx]: Authentication tried for hostname with correct key but not from a permitted host (host=xx.xx.xx.xx, ip=xx1.xx.xx.xx).
 sshd[xxxxx]: Connection closed by xx.xx.xx.xx port 4xxx2 [preauth]

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6

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