The Guru wrote:

When I try to connect, stunnel reports an error "wrong version number". [cut] read from 0x4b5f98 [0x4cc0a0] (7 bytes => 7 (0x7)) 0000 - 16 03 00 0d 01 02 ......

Your server reply protocol version is 3.0. You may wish to enable TLS on your server, or to specify: sslVersion = SSLv3 in your stunnel.conf. Best regards, Michal Trojnara