IConfigurationSectionHandler is deprecated since .NET 2.0

[mstaessen]

IConfigurationSectionHandler is deprecated since .NET 2.0, The ConfigSectionHandler should derive from ConfigurationSection.
https://msdn.microsoft.com/en-us/library/system.configuration.iconfigurationsectionhandler(v=vs.110).aspx

When using the handler as-is without section-group, logging is not wired.
When using the handler in a section group in combination with a virtual directory on IIS Express, it fails bootstrapping the configuration.

I haven't validated whether they are related, but it might be plausible.