Fix Network Stalling on OS X 10.10.0/1

If your network connection (especially ethernet connection) stalling/freezing from time to time, try disabling the new MultiPath TCP (MPTCP).

To turn it off:

sudo sysctl -w net.inet.mptcp.enable=0

to make it permanent edit (create if not exists) /etc/sysctl.conf and add:

net.inet.mptcp.enable=0

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