I'm re-evaluating Netflow.

Is it possible to view conversations between a client that uses http to connect to the server via a proxy. 

For example, we have a client that accesses a server via proxy. The connection appears as 8080 because of the proxy, however the actual connection the server is on port 23. 

Because of the proxy we can't see the connection on port 23. Is it possible to see the connection on port 23?

I hope I explained myself well

Cheers

Carlton