FCM send msg through firewall using firebase-admin

Question

In company we have firewall.
We've enabled fcm.googleapis.com 433 adress. But it havent helped. Still jboss application can not send push request using com.google.firebase:firebase-admin library. I know about range of IPs but that is not possible for admins to maintain such range of IPs in our company.
But we can set it for url names (I was told so). But this one addres havent helped. I've looked into

com.google.firebase:firebase-admin    
com.google.auth:google-auth-library-oauth2-http 

And found few other addresses:

https://accounts.google.com
https://iid.googleapis.com

Have anyone else opened firewall for such adresses? Maybe I need something else? (Ive sent it to network ppl, but they wont do it immediately, so maybe I can correct it before they start)

Answer 1

For that moment it worked for those 3 addresses. It is working for few days now. Forgot to mention it here. Will try post anything if it's gonna change. I am not sure when 3rd address is used, second one is during initialization of firebase mechanisms to take token.
For sure there is no need to make exception in firewall for specific database url that is given by your project, it is sent in parameters to fcm.googleapis.com and probably google use it somehow there. Would be nice for official answer here from one of fcm developers, but cant help it. Cheers

• https://fcm.googleapis.com
• https://accounts.google.com
• https://iid.googleapis.com