I am using elmah (v1.1.11517.0) and am trying to move the config to an external source.
My config currently looks like this:
The reason why you can't use the configSource element for elmah is because elmah is defined as a sectionGroup. You can use the configSource on Sections. That is why it works on log4net.
If you need the seperate config-file for web-deployment like Dan Atkinson you could do the following:
The downside is that you need a config file for each section. But you often do that for web deployment projects.