When an app is in a Force Stopped / Force Killed state most events including FCM messages for push notifications will not be received. If you check the logs from the app, you may also see: ERROR: Encountered error during push registration with OneSignal:Įrror Domain=OneSignalError Code=0 "(null)" UserInfo= FCM doesn't provide specific IPs, so you should allow your firewall to accept outgoing connections to all IP addresses contained in the IP blocks listed in Google's ASN of 15169. FCM typically only uses 5228, but it sometimes uses 52. If you are restricting traffic to or from the Internet, you need to configure it to allow connectivity with FCM in order for your Firebase Cloud Messaging client apps to receive messages.
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