Can’t connect to Visual Studio Online from any version of in VS: "The underlying connection was closed: An unexpected error occurred on a send."

Interesting one today.   PROBLEMCustomer reported not being able to connect to VSO from any VS version. Kept getting this: The server returned the following error: TF400324: Team Foundation services are not available from server <ACCOUNT>.visualstudio.com\DefaultCollection. Technical information (for administrator):  The underlying connection was closed: An unexpected error occurred on a send. TROUBLESHOOTING The customer…

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Timeouts uploading bits to drop folder from on-prem build controller connected to VSO

Had an interesting case recently. Customer was using an on-prem build controller connected to VSO. His Team Project was backed by Git and he had a team build using the GitTemplate.12.xaml Build Template. Problem was the build definition was failing about 78% of the time. The build itself completed, but the final phase failed.  The error was: Exception…

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