'vortex.data.Microsoft.com waiting for Microsoft ReportViewer2015

We’re running a website written in Visual Studio C# We’ve just added Microsoft ReportViewer2015 (to replace ReportViewer2010) to the website. However, Since this change I'm randomly get no response and the message:

"Waiting for vortex.data.Microsoft.com…"

in the bottom left of the Edge web browser (worse in chrome ~60seconds wait).

Everything else is equal on processing and I've even put the old one back in with no issues from it. The wait can be 20 to 30 seconds and appears when we run up screens on the website using, and not using, ReportViewer.

It seems odd that a company like Microsoft would use a Server without the resources it needs to run vortex.data.Microsoft.com.

Could vortex.data.Microsoft.com be the problem, or is it likely to be something else?

https://i.stack.imgur.com/pz9yn.png



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