You upgrade your management server from a previous version to version 12.1. After the upgrade, Symantec Network Access Control is disabled on your legacy clients.
Symantec Endpoint Protection clients must include a Host Integrity policy for Symantec Network Access Control to be enabled.
This issue appears only if you do not assign a Host Integrity policy to your clients. Add a Host Integrity policy to the groups that include your legacy clients. Symantec Network Access control is then enabled.
Imported Document ID: TECH162853
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