http://developers.de/blogs/rolf_nebhuth/archive/2009/05/26/custom-wcf-tracing-problem-with-propagateactivity-attribute.aspxIf you want to trace in the same trace source as WCF you can use this Example in Damir Dobric Blog . But if you use the WCF Configuration Editor to generate the System.Diagnostic section in the configuration file, this call will fail with the error “enCommunityServer 2008 SP1 (Build: 30619.63)