I oversee a LAN whose only external connection is a proxy server link to an ISP. The internet access serves for research and email. No site is hosted internally, but updated remotely.
The proxy server is hosted on Windows2000 machine. All the PCs are running windows2000 and linked to the proxy server on the same LAN which host the main application on a unix platform. What are the possible threats to this setup? Is a firewall necessary?
