NBU - Firewall

Hi,

Would like to confirm on firewall settings of NBU.

Originally, customer's firewall is off for NBU environment. Now, they opened ports 13782, 13724, 1556, 13720 and 13783 and wants to turn on firewall.

I believe backups will still run because the important ports are open. Is it safe to say that they can turn on their firewall even there are on-going backups? Will backups be interrupted?

Thanks!

NBU version is 7.6.0.4 running on Win 2008 R2