This topic describes several issues and troubleshooting recommendations. Error in the Carbon Black EDR Console InterfaceReview the log file: /var/log/cb/coreservices/debug.log for a Python stack trace with details. Sensors Are Not Checking inIf a sensor is not checking in, look in the log file: /var/log/cb/nginx/access.log for a request from the host. Verify that Everything is WorkingCheck the nginx access.log for ‘ 200 ’ HTTP response codes. 200 codes indicate that communications are working properly. Parent topic: Server Logs