[stunnel-users] "Reverse" tunneling with stunnel.

I have a client who is setting up a logging infrastructure involving a couple of DMZs forwarding logs into central logging points.

They have to pass compliance audits (SOX, PCI at least) and have some rather specific desires in regards to how they want the log traffic to move, and which servers *initiate* the connections.

Which is to say they want the internal servers to set up tunnels to the DMZ servers and then the forwarders use that tunnel to deliver logs back.

Lemme see if I can ascii art this:

central1----------------------------------dmz1 ____________________ / _____________________\ _/ / \ central2----------------------------------dmz2

Something like that.

Central1=10.10.1.2 Central2=10.9.1.2

DMZ1=172.18.0.5 DMZ2=172.20.0.5

Firewalls are in effect.

I have gotten it set up so that I can initiate a connection FROM Central1 to DMZ2.

[Tunnel_to_DMZ2] client = yes accept = 3002 connect = 172.20.0.5:5000

And

[Tunnel_from_Central1] accept = 5000 connect = 3000

Like I said, I can open a tunnel from Central1 to DMZ2, but can't get traffic to pass backwards--I get a message in the log saying the session is closed.

Is it possible to set stunnel up in a "reverse tunnel" mode--one where the connect is initiated from one end, but the other does most of the message passing?

What I am missing?

Thanks, Petro.