The TCP state graph for the situation is: https://i.imgur.com/USECPtc.png
You can see at 16:55 the FIN_WAIT1 ,CLOSE_WAIT and ESTABLISHED takes a steep climb, At this point Nginx hangs as the server has a script that checks stub status and this doesn't finish. The server itself and all other services like sshd works pretty fine ,except Nginx At 17:06 you can see the connection states drop steeply too. this is the point where Nginx is stopped and Apache takes over as the webserver The ESTABLISHED and CLOSE_WAIT drop fully and the FIN_WAIT1 reduces slowly and finally attain normalcy at 17:15 Apache continued working fine with the same amount of external traffic and same firewall setup Posted at Nginx Forum: https://forum.nginx.org/read.php?2,282613,282650#msg-282650 _______________________________________________ nginx mailing list nginx@nginx.org http://mailman.nginx.org/mailman/listinfo/nginx
