01-06-2016
It is very difficult for me to provide meaningful answers without knowing the full topology of your network; whether your servers are indeed using static internet addresses, and how your client workstations access the internet - switches (managed or unmanaged, firewall(s), internet router (and how it's configured), etc. Perhaps you could have a go at describing that to us all. Are the clients on a different ip domain (class c address) than the servers?
As far as your question regarding a proxy for http traffic (man-in-the-middle) there are hundreds of publically usable proxies out there (principally used to prevent tracking). These exist on every continent of the planet and many are reliable, many are not reliable.
Search Google for "free proxy list".
For http traffic you could test one of your Windows clients by setting the IE connection to "use proxy server" and configuring the ip address of your chosen proxy. See if that works reliably. If not, pick another proxy.
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