Windows Server 2016 PR validation is failing with bad Docker installation

[lbussell]

Our public Windows Server 2016 build agent VM images were updated and something is wrong with the Docker installation in them. The symptom is that the Docker daemon is not running when you try to invoke the Docker CLI:

error during connect: this error may indicate that the docker daemon is not running: Post "[http://](http://%2F%2F.%2Fpipe%2Fdocker_engine/v1.47/images/create?fromImage=mcr.microsoft.com%2Fdotnet-buildtools%2Fimage-builder&tag=2532486%22)

[lbussell]

Docker versions newer than 20.10.24 don't support Windows Server 2016.

As a temporary workaround, I have asked DDFUN to create a new Windows Server 2016 VM image with Docker version 20.10.24 installed. That should unblock PR validation.

Separately, I am investigating #1081 as a long-term solution.

[lbussell]

[Triage] This is fixed by using an older version of Docker per the comment above. Here is a passing run: https://github.com/dotnet/dotnet-docker/blob/98c945054b112b396c3a77efcfe32ee86d49afb7/README.aspnet.md?plain=1#L59-L66

The long-term investigation will continue as part of #1081