OGS Connection issues for BT users - and maybe others (update)

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Since I had been suspicious about the router firmware update that happened around the same time frame, I connected my laptop directly to the pppoe on the openreach modem and can confirm that in that configuration as well the cloudflare websocket goes silent after 20 seconds. So whatever is going on is happening deeper in the network, not a bad router software update.

FWIW, this reproduces the issue without relying on websockets and without referencing anything about online-go.com specifically:

(while :; do
  echo 'HEAD / HTTP/1.1';
  echo 'Host: www.cloudflare.com';
  echo;
  sleep 5;
done) | \
  openssl s_client -tls1_3 \
    -servername www.cloudflare.com \
    -connect '[2606:4700:20::681a:24]:443'

This will see 4 successful responses but then go quiet after that (so, after 20 seconds), from a BT home internet, but keeps on going indefinitely if I connect from an ipv6 capable server I have access to.

I the headers, I noticed CF-RAY: 93d14f85783048cb-LHR on the failing connection (it was a different site ID for the successful one, despite the same IP address). I wonder if it could also be that it’s a cloudflare bug but it’s not rolled out globally?

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