Updating Symantec Endpoint Protection (SEP) involves downloading new content definitions (virus definitions, IPS signatures) or upgrading the client software itself. The process differs based on whether you are using a managed environment (SEPM) or unmanaged clients. 1. Update SEP Manager (SEPM) & Clients (Managed)
Ensure that port 443 (HTTPS) and port 80 (HTTP) are open for the LiveUpdate domains. Conclusion symantec endpoint protection update download