From your description I gather that you have stunnel at both the client and server side?
No, just stunnel on server side, on client side it's InternetExplorer, but now I can use Firefox with flash plugin because my problem is solved.
If I remember correctly you should put the CA chain in the 'server.pem' file together with your server certificate.
You remember right ! But you remember that from where?? I put certification chain with certificate in server certificate file and it works now!!
Thx for all Jan,
Oliver