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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LEARN ABOUT XFREE86
xfindproxy
XFINDPROXY(1) General Commands Manual XFINDPROXY(1)
NAME
xfindproxy - locate proxy services
SYNOPSIS
xfindproxy -manager managerAddr -name serviceName -server serverAddr [-auth] [-host hostAddr] [-options opts]
DESCRIPTION
xfindproxy is a program used to locate available proxy services. It utilizes the Proxy Management Protocol to communicate with a proxy
manager. The proxy manager keeps track of all available proxy services, starts new proxies when necessary, and makes sure that proxies are
shared whenever possible.
The -manager argument is required, and it specifies the network address of the proxy manager. The format of the address is a standard ICE
network id (for example, "tcp/blah.x.org:6500").
The -name argument is required, and it specifies the name of the desired proxy service (for example, "LBX"). The name is case insensitive.
The -server argument is also required, and it specifies the address of the target server. The format of the address is specific to the
proxy service specified with the -name argument. For example, for a proxy service of "LBX", the address would be an X display address
(e.g, "blah.x.org:0").
The -auth argument is optional. If specified, xfindproxy will read 2 lines from standard input. The first line is an authoriza-
tion/authentication name. The second line is the authorization/authentication data in hex format (the same format used by xauth). xfind-
proxy will pass this auth data to the proxy, and in most cases, will be used by the proxy to authorize/authenticate itself to the target
server.
The -host argument is optional. If xfindproxy starts a new proxy service, it will pass the host specified. The proxy may choose to
restrict all connections to this host. In the event that xfindproxy locates an already existing proxy, the host will be passed, but the
semantics of how the proxy uses this host are undefined.
The -options argument is optional. If xfindproxy starts a new proxy service, it will pass any options specified. The semantics of the
options are specific to each proxy server and are not defined here. In the event that xfindproxy locates an already existing proxy, the
options will be passed, but the semantics of how the proxy uses these options are undefined.
If xfindproxy is successful in obtaining a proxy address, it will print it to stdout. The format of the proxy address is specific to the
proxy service being used. For example, for a proxy service of "LBX", the proxy address would be the X display address of the proxy (e.g,
"blah.x.org:63").
If xfindproxy is unsuccessful in obtaining a proxy address, it will print an error to stderr.
SEE ALSO
proxymngr (1), Proxy Management Protocol spec V1.0
AUTHOR
Ralph Mor, X Consortium
XFree86 Version 4.7.0 XFINDPROXY(1)