I recently started working with firebase. I'm following a tutorial on the internet, and in my application status does not update. I know that with Firebase it updates on time. I'm working on the company's internal network and it contains a firewall. Is the firewall blocking?
If so, does anyone know the door?
Yes, your firewall may be blocking. Read here this Connection Server Protocol Implementation article.
If your organization has a firewall that restricts traffic to / from your Internet, you must configure it to allow connectivity to the FCM for Firebase Cloud Messaging client applications receive messages. The doors to be opened are: 5228, 5229 and 5230. Typically, FCM uses only port 5228, but occasionally uses the ports 5229 and 5230. FCM does not provide specific IPs, so you You must authorize the firewall to accept outgoing connections with all IP addresses contained in the IP blocks listed in the Google ASN of 15169.
