nginx reverse proxy 502 bad gateway error

[cruise]

Log file details.

2013/04/13 00:03:29 [alert] 10931#0: open socket #13 left in connection 3
2013/04/13 00:03:29 [alert] 10931#0: open socket #22 left in connection 14
2013/04/13 00:03:29 [alert] 10931#0: open socket #23 left in connection 15
2013/04/13 00:03:29 [alert] 10931#0: open socket #27 left in connection 19
2013/04/13 00:03:29 [alert] 10931#0: aborting
2013/04/13 01:07:53 [notice] 11471#0: using the "epoll" event method
2013/04/13 01:07:53 [notice] 11471#0: start worker processes
2013/04/13 01:07:53 [notice] 11471#0: start worker process 12080
2013/04/13 01:07:53 [notice] 11471#0: start cache manager process 12081
2013/04/13 01:07:53 [notice] 11471#0: signal 17 (SIGCHLD) received
2013/04/13 01:07:53 [notice] 11471#0: cache manager process 11474 exited
with co                             de 0
2013/04/13 01:07:53 [notice] 11471#0: signal 29 (SIGIO) received
2013/04/13 01:07:56 [notice] 11471#0: signal 17 (SIGCHLD) received
2013/04/13 01:07:56 [notice] 11471#0: worker process 11473 exited with code
0
2013/04/13 01:07:56 [notice] 11471#0: signal 29 (SIGIO) received
2013/04/13 01:08:01 [notice] 11471#0: signal 15 (SIGTERM) received, exiting
2013/04/13 01:08:01 [notice] 12081#0: exiting
2013/04/13 01:08:01 [notice] 12080#0: exiting
2013/04/13 01:08:01 [notice] 12080#0: exit
2013/04/13 01:08:01 [notice] 11471#0: signal 17 (SIGCHLD) received
2013/04/13 01:08:01 [notice] 11471#0: cache manager process 12081 exited
with co                             de 0
2013/04/13 01:08:01 [notice] 11471#0: signal 29 (SIGIO) received
2013/04/13 01:08:01 [notice] 11471#0: signal 17 (SIGCHLD) received
2013/04/13 01:08:01 [notice] 11471#0: worker process 12080 exited with code
0
2013/04/13 01:08:01 [notice] 11471#0: exit
2013/04/13 01:08:06 [notice] 12128#0: using the "epoll" event method
2013/04/13 01:08:06 [notice] 12128#0: nginx/1.0.15
2013/04/13 01:08:06 [notice] 12128#0: built by gcc 4.4.6 20120305 (Red Hat
4.4.6                             -4) (GCC)
2013/04/13 01:08:06 [notice] 12128#0: OS: Linux 2.6.32-042stab055.10
2013/04/13 01:08:06 [notice] 12128#0: getrlimit(RLIMIT_NOFILE): 65535:65535
2013/04/13 01:08:06 [notice] 12129#0: start worker processes
2013/04/13 01:08:06 [notice] 12129#0: start worker process 12131
2013/04/13 01:08:06 [notice] 12129#0: start cache manager process 12132
2013/04/13 01:08:06 [notice] 12129#0: start cache loader process 12133
2013/04/13 01:09:06 [notice] 12133#0: http file cache:
/usr/local/nginx/proxy 0.                             000M, bsize: 4096
2013/04/13 01:09:06 [notice] 12129#0: signal 17 (SIGCHLD) received
2013/04/13 01:09:06 [notice] 12129#0: cache loader process 12133 exited with
cod                             e 0
2013/04/13 01:09:06 [notice] 12129#0: signal 29 (SIGIO) received

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,238322,238325#msg-238325