This extension makes use of the Logging system introduced in TYPO3 CMS 6.0. It is far more flexible than the old one writing to the “sys_log” table. Technical details may be found in the TYPO3 Core API.

As an administrator, what you should know is that the TYPO3 Logger forwards log records to “Writers”, which persist the log record.

By default, with a vanilla TYPO3 installation, messages are written to the default log file (var/log/typo3_*.log).

Dedicated log file for LDAP

If you want to redirect every logging information from this extension to var/log/ldap.log and send log entries with level “WARNING” or above to the system log, you may add following configuration to typo3conf/AdditionalConfiguration.php:

$GLOBALS['TYPO3_CONF_VARS']['LOG']['Causal']['IgLdapSsoAuth']['writerConfiguration'] = [
    \TYPO3\CMS\Core\Log\LogLevel::DEBUG => [
        \TYPO3\CMS\Core\Log\Writer\FileWriter::class => [
            'logFile' => Environment::getVarPath() . '/log/ldap.log'

    // Configuration for WARNING severity, including all
    // levels with higher severity (ERROR, CRITICAL, EMERGENCY)
    \TYPO3\CMS\Core\Log\LogLevel::WARNING => [
        \TYPO3\CMS\Core\Log\Writer\SyslogWriter::class => [],


Be sure to read t3api:logging-configuration to fine-tune your configuration on any production website.