Hi Vincent,
I gather that you are downloading the .jdb via FTP and dropping it on your SEPM or clients. That method works great for the AntiVirus definitions, but doesn't supply you with firewall, PTP etc materials. Using AV alone is fighting today's threats with one arm tied behind your back - I really recommend that you add NTP and IDS technologies to better secure those endpoints.
If you are using FTP as that is the only method available due to network restrictions, ther is one goo dsolution: have you considered setting up an internal LIveUpdate Administrator 2.x server? That can download via FTP new updates for all the different components, and then make them availabole for all the SEP clients to use.
Hope this helps! Please do update this thread if you'd like more info,
Best regards,
Mick