monit stopped to report Port response time

[Former user]

all of a sudden monit stopped to report "Port response time" only a "-" is in the web status output - this happend with 5.20.6 - i updated today to 5.21.0 - still only "-" for all Port response time fields. When it stopped to report no restart or configuration change was done. It just does no more report Port response time. I use this information for tracking web server response times. See http://pie2.ypack.de/open/mrtg/heart.hote.html for the corresponding graph. Any idea why?

[Tildeslash]

Please can you provide the following data?:

1. output of "monit status"
2. monit log
3. monit configuration file

[Tildeslash]

waiting for data ... no response from reporter -> closing