NuGet fails: “The underlying connection was closed: An unexpected error occurred on a send”

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Try pasting the following into a .reg file and run it. Then try running your NuGet command (no reboot required).

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319]
"SchUseStrongCrypto"=dword:00000001

Ran into this issue because TLS1.2 was not enabled (similar to Tony’s response). Using http does not fix the situation because NuGet redirects to https now that TLS1.2 is enforced.

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