Renewal of Information Security scanning solution

The firewall software we use across the 4 sites (which cannot be easily changed as it would require many months of intensive work across the 4 sites) has a specific firewall hardware compatibility list for the server hardware it supports. The existing firewall hardware is nearing end of life but we need to have ongoing compatibility with the incoming/outgoing hardware/software platform, This system handles all incoming/outgoing (Internet) traffic at all 4 UKCEH sites (including all remote workers VPN connections) a...