Log4net inside BHO does not work?

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I'm trying to use log4net with an external config file, but it does not work: nothing gets logged

<?xml version="1.0" encoding="utf-8" ?>
<log4net>   
    <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
        <file value="C:\\tmp\\test.log" />
        <appendToFile value="true" />
        <maximumFileSize value="100KB" />
        <maxSizeRollBackups value="2" />

        <layout type="log4net.Layout.PatternLayout">
            <conversionPattern value="%level %thread %logger - %message%newline" />
        </layout>
    </appender>

    <root>
         <appender-ref ref="RollingFile" />
    </root>
</log4net>

If I use this line in Assembly.cs, test.lg is creatd when the BHO is registered with regasm, but not when the plugin is running:

[assembly: log4net.Config.XmlConfigurator(ConfigFile = @"C:\\tmp\\test.log4net", Watch = true)]

When I use this code inside the BHO, no log is adde to test.log:

XmlConfigurator.Configure(new System.IO.FileInfo(@"C:\\tmp\\test.log4net"));
log.Info("test");

I'm not sure what I am doing wrong.

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Julien On BEST ANSWER

The log4net configuration file was fine. The problem is that Internet Explorer ran in Protected Mode, which forbids BHOs to write to arbitrary folders. There are only a few folders where the BHO can write.