Troubleshooting the sensor
This topic describes common problems that occur with the DNS sensor and presents solutions for those problems.
Sensor fails to discover a DNS server
- Problem
- The sensor is unable to discover a running DNS server.
- Solution
- If the sensor fails to discover a DNS server, verify that the DNS server can resolve IP address 127.0.0.1. The DNS sensor requires the DNS server to resolve 127.0.0.1 and, if the DNS server does not return a value, the sensor fails to recognize the particular DNS server.