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Unable to run windows firewall on server 2003

Last Modified: 2012-12-23
When trying to access the firewall in windows server 2003 i receive the following message "Windows Firewall cannot run becuase another prgram or service is running that might use the network address translation component (Ipnat.sys)

We have the following server roles installed and running:

File server
Printe server
Remote Access/VPN server
Domain Controller
DNS server
DHCP Server

Any ideas on what would be causing the firewall properties not to open and will it be running?
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