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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

rickvdbosch
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Greg Bala
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1 Answers1

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This could happen when the IP address of "Availability Test clients" in this "partiular Azure region (from where the failure is being noticed frequently)" is not added to the allowed list on the Firewall/security system. Please refer to Availability tests and Addresses grouped by location (Azure Public Cloud) table in the above link to get all the required addresses related to "Availability Test Clients" of a particular Azure region and ensure that they are added to your firewall's Allowed List.

For more details, you may also refer to the discussion here on similar topic: https://learn.microsoft.com/en-us/answers/questions/755004/index.html

AnuragSingh-MSFT
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