Hi SKN,
I am not 100% sure about this, but to think of using 3rd party Proxy server acting as RI instance should not be possible.
One reason I can give is that the traffic/protocol between internal and RI instance is webMethods propriety. Unless webMethods has specifically given license to other vendors, I guess it would not work.
I suggest that you get the right/accurate answer on this from webMethods itself (place a call to webM support).
HTH,
Saurabh.
#webMethods#webMethods-Architecture#webMethods-General#Integration-Server-and-ESB