I'm currently using PRTG to monitor my Internet Performance for a number of websites. I'm seeing odd behavior whereby some websites will show 0ms response times (and sometimes the sensor will simply timeout.) I configured a secondary machine and configured the exact same websites and these work without issues from there.
Is there anything I can check to work out why this is happening? I've tried using; Chromium, PhantomJS and Internet Explorer and see the same results across browsers. However when I click on the device name and browse to the site it loads without issue.
I've verified my proxy details are valid and that I am able to browse to those sites normally.
An example site which shows this problem is http://www.dailymail.co.uk.
I spotted another thread which spoke about upgrading to a newer version of PRTG due to a bug in the HTTP Full Page sensor however I am running the latest available release (188.8.131.523+).
Any suggestions or logs I can look at to dig into this issue? Richard