'False negative in Azure Application Insights Availability Test

I have setup Availability Test using Application Insights and using uptrends.com. I am pinging simple http resources. This resource does redirects before it returns 200.

I am getting a lot of errors in azure AI, from certain regions only. I cannot confirm, in any way (not via VMs deployed in that region, not via other services like uptrends.com) that there are failures.

The error is:

A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond [...]:443

The failure occurs after just 20 seconds, when I have timeout configured at 120 seconds.

It appears Availability Tests are giving me false negatives ... any ideas?

False negatives



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