NGINX + Subsonic + Custom port

I posted on the subsonic forum, but because I'm using nginx, maybe you guys can help.

you can find my post on subsonic here:
http://forum.subsonic.org/forum/viewtopic.php?f=2&t=14579&sid=068b793be70ade3f015d70feba253108&p=63831#p63831

my problem is, when using nginx (SSL:8443) to proxy subsonic (SSL:4141) I get a 502 bad gateway, and this error in the log:

2014/07/24 21:14:02 [error] 22465#0: *3 SSL_do_handshake() failed (SSL: error:14077438:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert internal error) while SSL handshaking to upstream, client: 10.66.26.1, server: subsonic.domain.org, request: "GET /favicon.ico HTTP/1.1", upstream: "https://127.0.0.1:4141/favicon.ico", host: "subsonic.domain.org:8443"

any idea?