Retrying package download/"connection was forcibly closed by host"

[jakirkham]

Have started seeing warnings around package downloads. Not entirely sure what is going on, but here is a typical example

DEBUG:urllib3.util.retry:Incremented Retry for (url='/conda-forge/win-64/python_abi-3.10-3_cp310.conda'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
WARNING:urllib3.connectionpool:Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /conda-forge/win-64/python_abi-3.10-3_cp310.conda
Preparing transaction: ...working... done
Verifying transaction: ...working... doneDEBUG:urllib3.util.retry:Incremented Retry for (url='/conda-forge/win-64/python_abi-3.10-3_cp310.conda'): Retry(total=2, connect=None, read=None, redirect=None, status=None)
WARNING:urllib3.connectionpool:Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ProtocolError('Connection aborted.', ConnectionResetError(10054, 'An existing connection was forcibly closed by the remote host', None, 10054, None))': /conda-forge/win-64/python_abi-3.10-3_cp310.conda

For more details, this came from this CI build. Have also attached the log for posterity.

[jakirkham]

A more severe and potentially related example is this failure that terminated the build (snippet below):

Download error (28) Timeout was reached [https://conda.anaconda.org/conda-forge/win-64/python-3.9.15-h4de0772_0_cpython.conda]
SSL/TLS connection timeout
##[error]Cmd.exe exited with code '-1073741819'.

For more details, this came from this CI build. Also have attached the log for posterity.