[stunnel-users] (Other) client to stunnel server 4.14

Hi all, I'm in a situation where Biztalk has to communicatie through Stunnel with a broker on a other site (both on Win XP). Now the only way to reach this broker is through a proxy, and that seems the problem with Stunnel, you can't configure a proxy. Is there another way, or another client that have the possibility to configure a proxy and can connect to a Stunnel server. With regards, Jurgen