Is it possible to blacklist or whitelist UNC paths using the URL field on the Policies page in ATP: Network or ATP: Endpoint Manager Web UI?
Symantec Advanced Threat Protection Manager or All-In-One Virtual Edition or Physical Appliance(s)
UNC whitelisting/blacklisting is not supported at this time.
Whitelisting/blacklisting based on digital certificate is being investigated as a future option in ATP whitelisting/blacklisting policy