SendPingAsync: Exception when using as root under macOS

[pgrosslicht]

Hello,

when using SendPingAsync as root on a macOS system, a SocketException is thrown (System.Net.Sockets.SocketException (56): Socket is already connected). If run as a regular user, it works. It also works for root if you use .NET 2.2. This leads me to believe that this behaviour was introduced in this commit c6efaf4. I also tested this on different macOS machines and the outcome was the same, but on a Ubuntu machine it works with sudo as well.

Here is the program I used to reproduce this issue: https://gist.github.com/pgrosslicht/0acf36322247793925dd62692b9202cd.
Here are screenshots running said program with .NET 3.1 with and without sudo and with .NET 2.2 with and without sudo.

Thanks in advance!

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[vcsjones]

@wfurt

[karelz]

Triage: Regression from @wfurt's changes in Linux, they regressed Mac.

[wfurt]

I confirmed this is a regression caused by dotnet/corefx#34084. It is not clear if #27996 was ever applicable to OSX. So far I was unable to reproduce it again either on Linux or OSX.