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Initialization module using log4net directly disables logging

Found in

EPiServer.CMS.Core 11.1.0

Fixed in

EPiServer.Logging.Log4Net 2.2.1

(Or a related package)


Jan 22, 2018


Jun 27, 2018


CMS Core


Closed, Fixed and tested


  1. Add the following intialization module:

        public class AA : IInitializableModule
            private static readonly log4net.ILog _log = log4net.LogManager.GetLogger("test");
            public void Initialize(InitializationEngine context)
            public void Uninitialize(InitializationEngine context)

EXPECTED: Logging works
ACTUAL: Logging stops working

Note: Sometimes for this bug fix to take affect you have to clear "Temporary ASP.NET Files", ie C:\Windows\Microsoft.Net\Framework64\v4.0.30319\Temporary ASP.NET Files\

WORKAROUND: An easy fix is to use namespace EPiServer.Logging.Compatiblity instead of log4net, to make sure log4net can be safely initialized from CMS instead from a custom initialization module.