OpenVPN has powerful logging capability suited well for the end user, the system administrator, and the software developer. Detailed information can be displayed from high-level networking and configuration options down to very low-level cryptographic components information.
Understanding the log file and the various affirmative and warning messages allows you to quickly and reliably determine the cause of a fault or to confirm a working setup. There are still some configuration parameters in which errors will not be apparent within the log file, and those will be covered in later chapters.