Added check for Stateview, added socket cancel to finish all connect,…

[SaltySnail]

Fix for some race condition related crashes of the server.

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[lionkor]

Question from the sidelines; boost docs say that close() already cancels

Use the close() function to simultaneously cancel the outstanding operations and close the socket.

What does this do internally, as we already close() right after?

Wondering since I use this API in other projects lol