I am sorry, I just noticed that ngin 1.0.5 has fixed the cache cause segmentation failure bug. And I was test it at 1.0.0. When I remove the following config, the server hasn't dead again now. >> proxy_ssl_session_reuse on; I will continued to keep checking. Posted at Nginx Forum: http://forum.nginx.org/read.php?2,213207,214356#msg-214356