# Nginx doesn't accept new connection **URL:** \ **Category:** NGINX\ **Created:** [October 14, 2011, 9:17am UTC](https://www.ruby-forum.com/t/nginx-doesnt-accept-new-connection/212802 "2011-10-14T09:17:02Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![dubstep](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/cdc98d/32.png) [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Post date:** [October 14, 2011, 9:17am UTC](https://www.ruby-forum.com/t/nginx-doesnt-accept-new-connection/212802/1 "2011-10-14T09:17:02Z")
Hi there, I am using nginx as a reverse proxy on a Debian Linux. The nginx is running on server A, and apache is running on server B. Server A is a pure proxy, server B is the real web server. In most of time, nginx works well. But the HTTP port (80) will stop accepting new connection sometimes. When it happened, I tried to telnet port 80 from the server by “telnet localhost 80”, the telnet was just keeping trying but cannot make socket connection. I checked the total HTTP connections by “netstat -an | grep 80 | wc -l”, the number was always less than 2000. I am using nginx package from Debian Linux, the package was installed by apt-get. I added “ulimit -n 65535” into /etc/init.d/nginx to turned the “open files” limitation. The problem is not resolved yet. Can anyone help? Thanks. Hyacinth Posted at Nginx Forum: > **[nginx doesn't accept new connection](https://forum.nginx.org/read.php?2,216681,216681#msg-216681)** > > Hi there, I am using nginx as a reverse proxy on a Debian Linux. The nginx is running on server A, and apache is running on server B. Server A is a pure proxy, server B is the real web server. In most of time, nginx works well. But the HTT ---
**Author:** ![mrkissinger](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/edb3f5/32.png) [@mrkissinger](https://www.ruby-forum.com/u/mrkissinger)\ **Post date:** [October 14, 2011, 9:25am UTC](https://www.ruby-forum.com/t/nginx-doesnt-accept-new-connection/212802/2 "2011-10-14T09:25:04Z")
On Fri, Oct 14, 2011 at 03:16:39AM -0400, mrkissinger wrote: > connection. > > I checked the total HTTP connections by “netstat -an | grep 80 | wc > -l”, the number was always less than 2000. > > I am using nginx package from Debian Linux, the package was installed > by apt-get. > I added “ulimit -n 65535” into /etc/init.d/nginx to turned the “open > files” limitation. > > The problem is not resolved yet. Can anyone help? What does “nginx -V” show ? Are any alerts in error\_log ? – Igor S. ---
**Author:** ![mrkissinger](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/edb3f5/32.png) [@mrkissinger](https://www.ruby-forum.com/u/mrkissinger)\ **Post date:** [October 14, 2011, 9:46am UTC](https://www.ruby-forum.com/t/nginx-doesnt-accept-new-connection/212802/3 "2011-10-14T09:46:43Z")
Dell-DB:~# nginx -V nginx: nginx version: nginx/1.1.4 nginx: TLS SNI support enabled nginx: configure arguments: --prefix=/etc/nginx –conf-path=/etc/nginx/nginx.conf –error-log-path=/var/log/nginx/error.log –http-client-body-temp-path=/var/lib/nginx/body –http-fastcgi-temp-path=/var/lib/nginx/fastcgi –http-log-path=/var/log/nginx/access.log –http-proxy-temp-path=/var/lib/nginx/proxy –lock-path=/var/lock/nginx.lock --pid-path=/var/run/nginx.pid –with-http\_gzip\_static\_module --with-http\_ssl\_module --with-ipv6 –without-http\_browser\_module --without-http\_geo\_module –without-http\_limit\_req\_module --without-http\_limit\_zone\_module –without-http\_map\_module --without-http\_memcached\_module –without-http\_referer\_module --without-http\_scgi\_module –without-http\_split\_clients\_module --with-http\_stub\_status\_module –without-http\_ssi\_module --without-http\_userid\_module –without-http\_uwsgi\_module –add-module=/tmp/buildd/nginx-1.1.4/debian/modules/nginx-echo Dell-DB:~# nginx error log is empty. Posted at Nginx Forum: > **[Re: nginx doesn't accept new connection](https://forum.nginx.org/read.php?2,216681,216683#msg-216683)** > > Hi there, I am using nginx as a reverse proxy on a Debian Linux. The nginx is running on server A, and apache is running on server B. Server A is a pure proxy, server B is the real web server. In most of time, nginx works well. But the HTT ---
**Author:** ![mrkissinger](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/edb3f5/32.png) [@mrkissinger](https://www.ruby-forum.com/u/mrkissinger)\ **Post date:** [October 14, 2011, 11:11am UTC](https://www.ruby-forum.com/t/nginx-doesnt-accept-new-connection/212802/4 "2011-10-14T11:11:58Z")
Any one help, please? Posted at Nginx Forum: > **[Re: nginx doesn't accept new connection](https://forum.nginx.org/read.php?2,216681,216690#msg-216690)** > > Hi there, I am using nginx as a reverse proxy on a Debian Linux. The nginx is running on server A, and apache is running on server B. Server A is a pure proxy, server B is the real web server. In most of time, nginx works well. But the HTT ---
**Author:** ![mrkissinger](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/edb3f5/32.png) [@mrkissinger](https://www.ruby-forum.com/u/mrkissinger)\ **Post date:** [October 17, 2011, 6:19am UTC](https://www.ruby-forum.com/t/nginx-doesnt-accept-new-connection/212802/5 "2011-10-17T06:19:12Z")
Resolved. SYN flood. Posted at Nginx Forum: > **[Re: nginx doesn't accept new connection](https://forum.nginx.org/read.php?2,216681,216803#msg-216803)** > > Hi there, I am using nginx as a reverse proxy on a Debian Linux. The nginx is running on server A, and apache is running on server B. Server A is a pure proxy, server B is the real web server. In most of time, nginx works well. But the HTT ---
**Author:** ![mrkissinger](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/edb3f5/32.png) [@mrkissinger](https://www.ruby-forum.com/u/mrkissinger)\ **Post date:** [October 14, 2011, 11:30am UTC](https://www.ruby-forum.com/t/nginx-doesnt-accept-new-connection/212802/6 "2011-10-14T11:30:28Z")
Some thing strange happened. I added 2 ports (80 and 10080) to a vhost in nginx server. When port 80 is not responsing, port 10080 works well. It seems that the apache on server B works well, and the nginx on server A is still working. The problem is that port 80 is not responsing or responses very slowly. Any opinions? Posted at Nginx Forum: > **[Re: nginx doesn't accept new connection](https://forum.nginx.org/read.php?2,216681,216691#msg-216691)** > > Hi there, I am using nginx as a reverse proxy on a Debian Linux. The nginx is running on server A, and apache is running on server B. Server A is a pure proxy, server B is the real web server. In most of time, nginx works well. But the HTT