I have DNS sensor configured to check my SOA record. I want to know if the serial number changes. So I put the current serial number in the "Check Results" field. The sensor was 'OK' for for I did that and "Record not found (code: PE112)" after I did it.
I found this odd, so I set it to "Write DNS result to disk". After checking the log file all it shows is one of the NS records. It looks like PRTG is not handling this sensor correctly. I am currently on version 188.8.131.5231.