While operating an RDS Gateway with SystoLOCK Plugin, you might encounter situations, where you would need to see why the gateway is not letting your users in. The Plugin logs its messages to standard Application log and its level is set to Informational by default.
If you need to see more (or less) of the logging, you can control the logging level with the following registry key: HKLM\SOFTWARE\Systola\SystoLock\RemoteDesktopGateway (you will need to create the key as it is not created by default).
Within that key, create a DWORD value named LogLevel and assign at a number from 1 to 5 that corresponds to the following levels:
Restart the Remote Desktop Gateway service (TSGateway) and observe any messages in the said log as users try to connect to your RDS farm.