An anonymous reader wrote , “FCM push notification is one of the few Google services available in China, as of the afternoon of September 22. Its domain name mtalk.google.com has been blocked in China recently. The method is keyword detection, and the SNI or Host is detected. Then a TCP reset attack is launched on the connection, and the attack occurs on all ports , including 443 and 5228 that actually provides services. Android users can enter *#*#426#*#* on the dial pad to view the current FCM connection status. Even if not The use of proxies to be notified of blocked apps is now discontinued. See discussion among V2EX users (login required). “
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