NIS Firewall is blocking incoming connections from application discoveryd emanating from IP 224.0.0.251 and ff02::fb.
Is this valid? Or should I unblock them?
System Apple iMac (late 2013): Yosemite: NIS 5.7 (25)
(Neither Norton nor Apple Support Chat lines have been of any use in answering the question when you can eventually get though to them, so I am hoping th experts in the Form can help.!)