The AS4 .NET Component uses NLog for logging. The logging levels can be configured to minimum: Fatal, and maximum: Trace. Further configuration can be found on the NLog support itself (https://github.com/nlog/nlog/wiki/Configuration-file )
The NLog configuration can be found in the Eu.EDelivery.AS4.ServiceHandler.ConsoleHost.config file.
When there are issues with signature-verification of a received AS4 Message, it is possible to enable extensive logging which can be helpful in pinpointing the problem. Signature verification logging can be enabled by enabling the XmlDsigLogSwitch trace-switch that can be found in the App.config configuration file:
