Sorry for the delay. I do think part of the issue is tied to the load balancer since that connection is timing out (we set it very low for testing purposes), but the load balancer terminating the connection doesn't explain why nginx is returning a 001 status code, since the connection from the nginx box to the origin box shouldn't be affected by that.

nginx -V:

nginx version: nginx/1.2.3
built by gcc 4.4.3 (Ubuntu 4.4.3-4ubuntu5.1)
TLS SNI support enabled
configure arguments: --prefix=/usr --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --with-http_ssl_module --with-http_gzip_static_module --error-log-path=/home/logs/error.log --pid-path=/etc/nginx/nginx.pid --lock-path=/var/lock/nginx.lock --with-http_geoip_module --with-http_addition_module --with-http_sub_module --with-http_stub_status_module --with-http_ssl_module --with-debug --with-http_realip_module --with-http_perl_module --add-module=/etc/nginx/yaoweibin-nginx-eval-module-706056b/ --add-module=/etc/nginx/yaoweibin-nginx_http_recaptcha_module-5d8f6b2/ --add-module=/etc/nginx/yaoweibin-nginx_secure_cookie_module-bcc69e5/ --add-module=/etc/nginx/ngx_http_redis-0.3.5/ --add-module=/etc/nginx/ngx_http_substitutions_filter_module/ --add-module=/etc/nginx/ngx_cache_purge-1.5/ --add-module=/etc/nginx/agentzh-redis2-nginx-module-1d79e5b/ --with-cc-opt=-Wno-error


Debug Log:

2013/04/16 15:38:37 [debug] 28029#0: *629969 rewrite phase: 3
2013/04/16 15:38:37 [debug] 28029#0: *629969 rewrite phase: 4
2013/04/16 15:38:37 [debug] 28029#0: *629969 post rewrite phase: 5
2013/04/16 15:38:37 [debug] 28029#0: *629969 generic phase: 6
2013/04/16 15:38:37 [debug] 28029#0: *629969 realip: "69.0.0.0"
2013/04/16 15:38:37 [debug] 28029#0: *629969 generic phase: 7
2013/04/16 15:38:37 [debug] 28029#0: *629969 generic phase: 8
2013/04/16 15:38:37 [debug] 28029#0: *629969 access phase: 9
2013/04/16 15:38:37 [debug] 28029#0: *629969 access phase: 10
2013/04/16 15:38:37 [debug] 28029#0: *629969 post access phase: 11
2013/04/16 15:38:37 [debug] 28029#0: *629969 try files phase: 12
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl handler
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl variable: "a"
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl variable: "v"
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl variable: "i"
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl variable: "r"
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl variable: "b"
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl variable: "upstream_http_content_type"
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl variable: "upstream_status"
2013/04/16 15:38:37 [debug] 28029#0: *629969 call_sv: 1
2013/04/16 15:38:37 [debug] 28029#0: *629969 perl handler done: 1
2013/04/16 15:38:37 [debug] 28029#0: *629969 http finalize request: 1, "/panel/?" a:1, c:2
2013/04/16 15:38:37 [debug] 28029#0: *629969 http terminate request count:2
2013/04/16 15:38:37 [debug] 28029#0: *629969 http terminate cleanup count:2 blk:0
2013/04/16 15:38:37 [debug] 28029#0: *629969 http finalize request: -4, "/panel/?" a:1, c:2
2013/04/16 15:38:37 [debug] 28029#0: *629969 http request count:2 blk:0
2013/04/16 15:38:37 [debug] 28029#0: *629969 http posted request: "/panel/?"
2013/04/16 15:38:37 [debug] 28029#0: *629969 http terminate handler count:1
2013/04/16 15:38:37 [debug] 28029#0: *629969 http request count:1 blk:0
2013/04/16 15:38:37 [debug] 28029#0: *629969 http close request
2013/04/16 15:38:37 [debug] 28029#0: *629969 http log handler
2013/04/16 15:38:37 [debug] 28029#0: *629969 run cleanup: 000000000DA332C8
2013/04/16 15:38:37 [debug] 28029#0: *629969 file cleanup: fd:18
2013/04/16 15:38:37 [debug] 28029#0: *629969 run cleanup: 00000000045C8C60
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 000000000F2C6570
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 00000000045C8210, unused: 0
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 000000000A2BB580, unused: 1
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 000000000DA32A90, unused: 0
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 00000000034DEB30, unused: 2901
2013/04/16 15:38:37 [debug] 28029#0: *629969 close http connection: 16
2013/04/16 15:38:37 [debug] 28029#0: *629969 reusable connection: 0
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 000000000DCE5A40
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 00000000038A6F70
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 00000000028DF7D0, unused: 8
2013/04/16 15:38:37 [debug] 28029#0: *629969 free: 0000000004433C10, unused: 115