OK, so there are three Virtual Servers? The client facing (proxy) one that lb's to 1.1 and 1.2 and terminates the SSL, then the Spotfire one (2.170), then a third (.2.171) that the Spotfire servers communicate with;
Client --> First VS --> Reverse Proxy Servers x2 --> Second VS --> Spotfire Servers x2 --> Third VS --> Servers x2
So what's the persistence method for the first VS, we've kind of missed that out? Do you actually need persistence anywhere else? Do the proxy servers open multiple connections to the Spotfire servers on behalf of a single client that's opened multiple connections to it? Same for Spotfire to whatever the last set of servers are?