We have a Watchguard firewall which we're aiming to use to filter staff Internet access. This has small piece of software which needs to download a database of websites to determine which category they fit into - e.g. gambling, games, email, etc. The software is hard-coded to download via port 80, but our proxy server needs requests on port 8080. Is there any free utility software out there that would 'see' the request leaving the computer on port 80 and redirect it to port 8080, or any other way of achieving the same end?