I have recently switched back to NIS for Mac after a few years of using a competitive product due to an unsolved issue in NIS that makes Application Blocking unusable. I am disappointed to see that the issues is still there and it looks like Symantec has done nothing about it. Please see Firewall Reporting Random Files trying to access the internet, http://community.norton.com/en/forums/internet-security-v56-25-application-blocking-blocks-random-files, http://community.norton.com/forums/connection-blocking-and-application-blocking-problems. All the threads about the issue are locked and there is no indication of any resolution or workaround.
Symantec support: can you please help and take another look at the issue? I have been a Symantec customer for a long time and would expect an issue like this to eventually get resolved. So far it has been 3+ years...