Hi Hendry,

my log4net.config file has this:

<?xml version="1.0"?>
<log4net>

  <root>
    <priority value="Info"/>
    <appender-ref ref="AsynchronousLog4NetAppender" />
  </root>

  <appender name="rollingFile" type="log4net.Appender.RollingFileAppender">
      <file type="log4net.Util.PatternString" value="App_Data\Logs\UmbracoTraceLog.%property{log4net:HostName}.txt" />
    <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
    <appendToFile value="true" />
    <rollingStyle value="Date" />
    <maximumFileSize value="5MB" />
    <layout type="log4net.Layout.PatternLayout">
      <conversionPattern value=" %date [P%property{processId}/D%property{appDomainId}/T%thread] %-5level %logger - %message%newline" />
    </layout>
    <encoding value="utf-8" />
  </appender>

  <appender name="AsynchronousLog4NetAppender" type="Log4Net.Async.ParallelForwardingAppender,Log4Net.Async">
    <appender-ref ref="rollingFile" />
  </appender>

  <!--Here you can change the way logging works for certain namespaces  -->

  <logger name="NHibernate">
    <level value="WARN" />
  </logger>


</log4net>

Then, Umbraco's default logs are writing correctly, only my custom logs are missing.