What does the error message "rsyslogd: omfwd: error 101 sending via udp: Network is unreachable" mean?

Solution Unverified - Updated -

Issue

  • Why the following errors are observed in /var/log/messages?

    rsyslogd: omfwd/udp: sendto() error: Network is unreachable [v8.2102.0-5.el8 try https://www.rsyslog.com/e/2354 ]
rsyslogd: omfwd: error 101 sending via udp: Network is unreachable [v8.2102.0-5.el8 try https://www.rsyslog.com/e/2354 ]

  • Why the messages are observed only after rebooting the server and then disappearing in 1-2 minutes? Nevertheless, messages are sent to the remote server as expected.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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