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syslog-ng Open Source Edition 3.30 - Mutual authentication using TLS

Testing what you have done


After configuring syslog-ng OSE, test if everything works as expected.

  1. On the client side, enter the following command:

    logger "This is a test message"

  2. On the server side, tail the file, where logs from the network are arriving. You should see something similar in case of the above test message:

    tail -f /var/log/messages | grep test

    Jun 26 19:12:06 root: This is a test message 

    If you cannot see it, check the log file, where the internal messages of syslog-ng are stored, both on the server and the client side. The most common causes of the problem are the following:

    • There is no trace of connection at all (internal logs show connection attempts), there is a network / firewall problem, or incorrectly configured destination or listening IP.

    • With new certificates an incorrectly configured clock can already cause problems. Check if all of your systems have the same time / time zone.

    • Make sure, that the Common Name is set to the correct FQDN or IP address. If you use FQDN, make sure, that your DNS server works correctly.

    • Do not include an email address in the client and server certificates.

    For more information about TLS-related error messages, see "Error messages" in the Administration Guide.


This tutorial has shown you how to encrypt and authenticate the connection between your clients and your logserver.

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