This could help you:
Allow a blocked program for Norton:
Sometimes the Smart Firewall blocks certain programs from accessing the Internet. Such programs might include certain streaming-media programs, network games, or custom business applications that are provided by your employer. If you know that the program's Internet activity is not a threat to your security, you can unblock the program's Internet access.
Allow a blocked program
In the Norton main window, click Settings.
In the Settings window, under Detailed Settings, click Firewall.
On the Program Control tab, select the program that you want to allow access to the Internet.
In the Access drop-down list for the program entry, click Allow.
Click Apply.
Information here
https://support.norton.com/sp/en/us/home/current/solutions/v6958602_ns_retail_en_us