Active Directory

Configuration

OpenKM 6.2
OpenKM 5.1
OpenKM 5.0
OpenKM 4.1 ( valid for older versions )

Enable debug on login process

OpenKM 6.2 - Tomcat

Edit the log4j configuration file located at $TOMCAT_HOME/conf/log4j.properties and add:

log4j.logger.org.springframework.security=DEBUG

Tomcat released with OpenKM has a configured a listener which watch the log4.properties files for changes, so you don't need to restart Tomcat to make these changes effectives.

OpenKM 5.1 - JBoss

It's good practice to enable login debugging when you make any change to the authentication mechanism. Edit the file $JBOSS_HOME/server/default/conf/jboss-log4j.xml and add the category ( remember you must restart jboss for it to take effect ):

<category name="org.jboss.security">
    <priority value="TRACE" class="org.jboss.logging.XLevel"/>
</category>

or

<category name="org.jboss.security">
    <priority value="TRACE" class="org.jboss.logging.XLevel"/>
    <appender-ref ref="SECURITY_F"/>
</category>

<appender name="SECURITY_F" class="org.jboss.logging.appender.DailyRollingFileAppender">
    <param name="Append" value="true"/>
    <param name="DatePattern" value="'.'yyyy-MM-dd"/>
    <param name="File" value="${jboss.server.home.dir}/log/jboss.security.log"/>
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" value="%d{ABSOLUTE} %-5p [%c] %m%n"/>
    </layout>
</appender>

More info at JBoss and JAAS debug.