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It is directly from the .NET code.

https://github.com/dotnet/runtime/blob/master/src/libraries/System.Net.Ping/src/System/Net/NetworkInformation/Ping.cs#L15

This is not true though:

• Ping.exe says 4000 ms = 4 seconds: https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/ping#parameters ==> so it is not like ping.exe.
• The timeout also depends on whether you can send ICMP over raw sockets or not. For example following code will timeout in 3 seconds on my Linux box:

var p = new Ping();
var sw = Stopwatch.StartNew();
var x = p.Send(new IPAddress(new byte[]{192, 168, 0, 42}));
Console.WriteLine(sw.Elapsed);
Console.WriteLine(x.Status);

However, it will timeout in 5 seconds if ran under sudo, because that will give it permission to send ICMP directly.

@wfurt could you please chime in here?

Also I digged up the original issue in runtime repo: dotnet/runtime#45888 It would be nice to include it in the description with a small text explaining why is this change happening next time.