Intermittent "504 SSL_do_handshake() failed"

[zealot83]

A similar problem occurred in my case.
Following is the ssl server configuration.
At first I used AJP.
But after I could not find a corresponding directive to
proxy_ssl_session_reuse, I changed to proxy.

upstream loadbalancer {
     server 127.0.0.1:8080;

      keepalive 100;
}

server {
        listen 443 default ssl;
        ssl on;

        ......

        location / {
            #access_log off;
            #ajp_pass    loadbalancer;
            proxy_pass http://loadbalancer;
            proxy_ssl_session_reuse off;
        }
}


Here's the error log:
2012/02/08 15:03:49 [info] 13273#0: *1 SSL_do_handshake() failed (SSL:
error:14094416:SSL routines:SSL3_READ_BYTES:sslv3 alert certificate
unknown) while SSL handshaking,

Any help would be greatly appreciated!
Thanks in advance!

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,144108,222098#msg-222098