Why rsyslog show the error message "No UDP listen socket could successfully be initialized, message reception via UDP disabled."

Solution Unverified - Updated -

Issue

  • Why rsyslog show the error message "No UDP listen socket could successfully be initialized, message reception via UDP disabled."
  • /var/log/messages file shows below error messages.

    • In RHEL8

      rsyslogd[10637]: No UDP socket could successfully be initialized, some functionality may be disabled.  [v8.1911.0-6.el8]
      rsyslogd[10637]: imudp: Could not create udp listener, ignoring port 67 bind-address (null). [v8.1911.0-6.el8]
      rsyslogd[10637]: imudp: no listeners could be started, input not activated.  [v8.1911.0-6.el8]
      rsyslogd[10637]: activation of module imudp failed [v8.1911.0-6.el8 try https://www.rsyslog.com/e/-3 ]
      
    • In RHEL7

      <syslog.err> rsyslogd:No UDP listen socket could successfully be initialized, message reception via UDP disabled.  [v8.24.0]
      <syslog.err> rsyslogd:imudp: no listeners could be started, input not activated.  [v8.24.0]
      <syslog.err> rsyslogd:activation of module imudp failed [v8.24.0 try http://www.rsyslog.com/e/-3 ]
      

Environment

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

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