Service Error : HTTP 500

Une autre information à mentionner :
l’instance passe par un reverse proxy nginx de la configuration suivante :

/etc/nginx/nginx.conf

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
    worker_connections 1024;
}

http {
    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /var/log/nginx/access.log  main;

    sendfile            on;
    tcp_nopush          on;
    tcp_nodelay         on;
    keepalive_timeout   65;
    types_hash_max_size 2048;

    include             /etc/nginx/mime.types;
    default_type        application/octet-stream;

    # Load modular configuration files from the /etc/nginx/conf.d directory.
    # See http://nginx.org/en/docs/ngx_core_module.html#include
    # for more information.
    include /etc/nginx/conf.d/*.conf;

    server {
        listen       80;
        listen       [::]:80;
        server_name  simplicite.mineralconseil.fr;

        location ^~/.well-known/acme-challenge/ {
                #allow all;
                root /usr/local/tomcat/webapps/ROOT;
        }
        location / {
                return 301 https://simplicite.mineralconseil.fr$request_uri;
        }

        error_page 404 /404.html;
            location = /40x.html {
        }

        error_page 500 502 503 504 /50x.html;
            location = /50x.html {
        }
    }

# Settings for a TLS enabled server.
#
  server {
        listen       443 ssl http2;
        listen       [::]:443 ssl http2;
        server_name  simplicite.mineralconseil.fr;

	ssl_certificate /etc/letsencrypt/live/simplicite.mineralconseil.fr/fullchain.pem;
    	ssl_certificate_key /etc/letsencrypt/live/simplicite.mineralconseil.fr/privkey.pem;

    	location / {
        	if ($request_method = 'OPTIONS') {
            		add_header Access-Control-Allow-Origin $http_origin;
            		add_header Access-Control-Allow-Credentials true;
            		add_header Access-Control-Allow-Headers Content-Type,Authorization,X-Requested-With,X-HTTP-Method-Override,X-Simplicite-Authorization;
            		add_header Access-Control-Allow-Methods GET,POST,PUT,DELETE,HEAD,OPTIONS;
            		add_header Access-Control-Max-Age 1728000;
            		add_header Content-Type text/plain;
            		add_header Content-Length 0;
            		return 204;
        	}
        	if ($request_method = 'GET') {
            		add_header Access-Control-Allow-Origin $http_origin always;
            		add_header Access-Control-Allow-Credentials true always;
            		add_header Access-Control-Expose-Headers X-Simplicite-SessionID;
        	}
        	if ($request_method = 'POST') {
            		add_header Access-Control-Allow-Origin $http_origin always;
          	 	add_header Access-Control-Allow-Credentials true always;            
                        add_header Access-Control-Expose-Headers X-Simplicite-SessionID;        	
                }		        	

            proxy_redirect off;
        	proxy_buffering off;
        	proxy_read_timeout 86400s;
        	proxy_send_timeout 86400s;
        	proxy_set_header Host $http_host;
        	proxy_set_header X-Real-IP $remote_addr;
        	proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        	proxy_set_header X-Forwarded-Proto https;
        	proxy_pass http://localhost:8443;
        	proxy_http_version 1.1;
        	proxy_set_header Upgrade $http_upgrade;
        	proxy_set_header Connection "upgrade";
    }

}
}


en vérifiant le fichier : /var/log/nginx/error.log j’obtiens les traces suivantes


2020/05/20 09:44:18 [crit] 20157#0: *1 open() "/var/lib/nginx/tmp/client_body/0000000001" failed (13: Permission denied), client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "POST /ui/json/app?action=editor&srv=save&object=ObjectInternal&rowid=2030&field=obo_script_id&scope=object&type=java&selected=ObjectInternal_obo_script_id_2030&_=25ed8fe0efec3d050cf138472f7fff72ece375da_20200520035700 HTTP/2.0", host: "simplicite.mineralconseil.fr", referrer: "https://simplicite.mineralconseil.fr/ui"
2020/05/20 09:46:43 [error] 20156#0: *379 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://127.0.0.1:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:46:43 [error] 20156#0: *379 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://[::1]:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:46:45 [error] 20157#0: *382 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://127.0.0.1:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:46:45 [error] 20157#0: *382 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://[::1]:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:46:49 [error] 20157#0: *385 no live upstreams while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://localhost/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:46:57 [error] 20157#0: *386 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://[::1]:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:46:57 [error] 20157#0: *386 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://127.0.0.1:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:47:12 [error] 20157#0: *390 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://[::1]:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:47:12 [error] 20157#0: *390 connect() failed (111: Connection refused) while connecting to upstream, client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "GET /ui/events HTTP/1.1", upstream: "http://127.0.0.1:8443/ui/events", host: "simplicite.mineralconseil.fr"
2020/05/20 09:48:10 [crit] 20157#0: *389 open() "/var/lib/nginx/tmp/client_body/0000000002" failed (13: Permission denied), client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "POST /ui/json/app?action=editor&srv=save&object=ObjectInternal&rowid=2033&field=obo_script_id&scope=object&type=java&selected=ObjectInternal_obo_script_id_2033&_=25ed8fe0efec3d050cf138472f7fff72ece375da_20200520094425 HTTP/2.0", host: "simplicite.mineralconseil.fr", referrer: "https://simplicite.mineralconseil.fr/ui"
2020/05/20 09:48:12 [crit] 20157#0: *389 open() "/var/lib/nginx/tmp/client_body/0000000003" failed (13: Permission denied), client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "POST /ui/json/app?action=editor&srv=save&object=ObjectInternal&rowid=2023&field=obo_script_id&scope=object&type=java&selected=ObjectInternal_obo_script_id_2023&_=25ed8fe0efec3d050cf138472f7fff72ece375da_20200520094425 HTTP/2.0", host: "simplicite.mineralconseil.fr", referrer: "https://simplicite.mineralconseil.fr/ui"
2020/05/20 09:48:15 [crit] 20157#0: *389 open() "/var/lib/nginx/tmp/client_body/0000000004" failed (13: Permission denied), client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "POST /ui/json/app?action=editor&srv=save&object=ObjectInternal&rowid=2024&field=obo_script_id&scope=object&type=java&selected=ObjectInternal_obo_script_id_2024&_=25ed8fe0efec3d050cf138472f7fff72ece375da_20200520094425 HTTP/2.0", host: "simplicite.mineralconseil.fr", referrer: "https://simplicite.mineralconseil.fr/ui"
2020/05/20 09:48:18 [crit] 20157#0: *389 open() "/var/lib/nginx/tmp/client_body/0000000005" failed (13: Permission denied), client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "POST /ui/json/app?action=editor&srv=save&object=ObjectInternal&rowid=2033&field=obo_script_id&scope=object&type=java&selected=ObjectInternal_obo_script_id_2033&_=25ed8fe0efec3d050cf138472f7fff72ece375da_20200520094425 HTTP/2.0", host: "simplicite.mineralconseil.fr", referrer: "https://simplicite.mineralconseil.fr/ui"
2020/05/20 09:53:04 [crit] 20156#0: *450 open() "/var/lib/nginx/tmp/client_body/0000000006" failed (13: Permission denied), client: 90.44.153.144, server: simplicite.mineralconseil.fr, request: "POST /ui/json/app?action=editor&srv=save&object=ObjectInternal&rowid=2033&field=obo_script_id&scope=object&type=java&selected=ObjectInternal_obo_script_id_2033&_=25ed8fe0efec3d050cf138472f7fff72ece375da_20200520094425 HTTP/2.0", host: "simplicite.mineralconseil.fr", referrer: "https://simplicite.mineralconseil.fr/ui"