Hi, Have had a really strange issue on a Nginx server configured as a reverse proxy wherein the server stops responding when the network connections in ESTABLISHED state and FIN_WAIT state in very high compared to normal working
If you see the below network graph, at around 00:30 hours there is a big spike in network connections in FIN_WAIT state, to around 12000 from the normal value of ~20 https://i.imgur.com/wb6VMWo.png At this state, Nginx stops responding fully and does not work even after a full restart of the service. Switching off Nginx and bring Apache service to the frontend (removing the reverse proxy) fix this and the connections drop Nginx config & build setting ################################## nginx -V nginx version: nginx/1.15.8 built by gcc 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) built with LibreSSL 2.8.3 TLS SNI support enabled configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/etc/nginx/modules --with-pcre=./pcre-8.42 --with-pcre-jit --with-zlib=./zlib-1.2.11 --with-openssl=./libressl-2.8.3 --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error_log --http-log-path=/var/log/nginx/access_log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/dev/shm/client_temp --http-proxy-temp-path=/dev/shm/proxy_temp --http-fastcgi-temp-path=/dev/shm/fastcgi_temp --http-uwsgi-temp-path=/dev/shm/uwsgi_temp --http-scgi-temp-path=/dev/shm/scgi_temp --user=nobody --group=nobody --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_stub_status_module --with-http_auth_request_module --with-file-aio --with-threads --with-stream --with-stream_ssl_module --with-http_slice_module --with-compat --with-http_v2_module --add-dynamic-module=incubator-pagespeed-ngx-1.13.35.2-stable --add-dynamic-module=/usr/local/rvm/gems/ruby-2.5.3/gems/passenger-6.0.0/src/nginx_module --add-dynamic-module=ngx_brotli --add-dynamic-module=echo-nginx-module-0.61 --add-dynamic-module=headers-more-nginx-module-0.32 --add-dynamic-module=ngx_http_redis-0.3.8 --add-dynamic-module=redis2-nginx-module --add-dynamic-module=srcache-nginx-module-0.31 --add-dynamic-module=ngx_devel_kit-0.3.0 --add-dynamic-module=set-misc-nginx-module-0.31 --add-dynamic-module=ngx_http_geoip2_module --add-dynamic-module=testcookie-nginx-module --add-dynamic-module=ModSecurity-nginx --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --with-ld-opt=-Wl,-E ##################################### # worker_processes auto; #Set to auto for a powerful server worker_processes 1; worker_rlimit_nofile 69152; worker_shutdown_timeout 10s; # worker_cpu_affinity auto; timer_resolution 1s; thread_pool iopool threads=32 max_queue=65536; pcre_jit on; pid /var/run/nginx.pid; error_log /var/log/nginx/error_log; #Load Dynamic Modules include /etc/nginx/modules.d/*.load; events { worker_connections 20480; use epoll; multi_accept on; accept_mutex off; } lingering_close off; limit_req zone=FLOODVHOST burst=200; limit_req zone=FLOODPROTECT burst=200; limit_conn PERSERVER 60; client_header_timeout 5s; client_body_timeout 5s; send_timeout 5s; keepalive_timeout 0; http2_idle_timeout 20s; http2_recv_timeout 20s; aio threads=iopool; aio_write on; directio 64m; output_buffers 2 512k; tcp_nodelay on; types_hash_max_size 4096; server_tokens off; client_max_body_size 2048m; reset_timedout_connection on; #Proxy proxy_read_timeout 300; proxy_send_timeout 300; proxy_connect_timeout 30s; #FastCGI fastcgi_read_timeout 300; fastcgi_send_timeout 300; fastcgi_connect_timeout 30s; #Proxy Buffer proxy_buffering on; proxy_buffer_size 128k; proxy_buffers 8 128k; proxy_busy_buffers_size 256k; #FastCGI Buffer fastcgi_buffer_size 128k; fastcgi_buffers 8 128k; fastcgi_busy_buffers_size 256k; server_names_hash_max_size 2097152; server_names_hash_bucket_size 128; ###################################################### -- *Anoop P Alias*
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