[isalist] firewall client

Hello All,
I have a client using ISA 2006 I have several rules restricting internet 
access. I use the http filter to block unwanted file extensions  and I also 
have a restricted protocol set. My question is this currently all workstations 
are secure nat clients. I recently have installed Symantec end point security 
and there is no parent server due to hardware restrictions. If I install 
firewall client can I allow only end point security to update without reducing 
my current rule set?

Thanks in Advance,
Jim

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