I'm fascinated by this line: "In macOS Sierra, ECN is enabled for 50 percent of TCP sessions. So should you run into a creaky old firewall that hasn't been upda

I'm fascinated by this line: "In macOS Sierra, ECN is enabled for 50 percent of TCP sessions. So should you run into a creaky old firewall that hasn't been updated in the past decade and a half (it happens), then clicking the link again will probably solve the issue." Introducing congestion features to a network is always scary (you can blackhole your clients and even trigger unintended behavior that affects the health of the network) but introducing non-determinism in your TCP connections seems like an odd way to do it.