log4net only works when XmlConfigurator.Configure() is called

I understand that this question has been asked several times, but unfortunately, I haven't been able to get my logging configuration working. I have to be making some very small mistake somewhere.

I have a .NET 4.5 MVC 4/EF 5 web application and I'm trying to get logging to work. The solution has two projects, one for the DAO's and model objects, and one for the web site. The App.Config file looks like this:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" requirePermission="false" />
  </configSections>
  <connectionStrings>
    <add name="RebuildingTogetherEntities" connectionString="stuff..."/>
  </connectionStrings>
  <entityFramework>
    <defaultConnection