Version (2002) V2.1 fixes this problem.
Your firewall or router is probably set to block "Ping" traffic, you can either enable this traffic or you can enable Use Proxy information for calibrating under Options - Proxy. Note that you do not want any proxy information entered in the above two fields (address and port) - enabling this just switches from "Ping" calibration to "Http" calibration.
Make sure that you are using the latest update. The latest version of SiteMonNak has a fix for this Norton AntiVirus issue.
We are running a test page at www.nakware.com/cgi-bin/sitemonnak-test.cgi, use this URL to temporally replace your current URL.
This page gives a 5xx error for 3 minutes then a 4xx error for 3 minutes then should be good for 4 minutes and repeats this cycle.
If you are unsure if your site uses hidden redirection then enable it.
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