After whitelisting files and enabling System Lockdown with the Symantec Endpoint Protect (RU4) client, the files are still blocked by System Lockdown.
Release : 14.3 RU4
This issue is resolved in Symantec Endpoint Protection 14.3 RU5, upgrade the Symantec Endpoint Protection Manager and Symantec Endpoint Protection clients to resolve this issue.
Jira CRE-10463