I don't have no any specific answer of this question but this will probably help you.
1. All configuration files are resides in /etc/NitroGuard/* you can cross check the configuration file with the standard configuration.
2. You can also review logs from /var/logs/* against any configuration file for previous and after patterns.
3. There is an article including some usefull commands of Receiver and some important path.
Hope this will help you ......