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HTTP status 500 when using Nginx with Jenkins

David Aldrich
September 06, 2023 11:16AM

We are using Nginx as a reverse proxy, connected to a Jenkins continuous integration server, to provide https access. Jenkins and Nginx run on the same Linux server.

A certain Jenkins function is failing when accessed via https. It works correctly when accessed via http (without nginx). Therefore, we suspect that something is wrong with our Nginx configuration.

In the failure condition, the browser (Edge) shows (in Developer Tools Console):

POST https://jenkins-temptest.<snip>/pipeline-syntax/generateSnippet 500

I don't know how to access the contents of the 500 reply.

Our /etc/nginx/nginx.conf contains:

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
worker_connections 768;
# multi_accept on;

http {

# Basic Settings

sendfile on;
tcp_nopush on;
types_hash_max_size 2048;
# server_tokens off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

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

# SSL Settings

ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;

# Logging Settings

access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;

# Gzip Settings

gzip on;

include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;

Our /etc/nginx/conf.d/ssl.conf contains:

server {

listen 443 ssl http2;
listen [::]:443 ssl http2;

# ssl on;
ssl_certificate /etc/nginx/certs/jenkins-temptest.pem;
ssl_certificate_key /etc/nginx/certs/jenkins-temptest.key;

server_name jenkins-temptest.<snip>;

location / {
sendfile off;
proxy_pass "";
proxy_redirect default;
# proxy_http_version 1.1;
proxy_set_header Host $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-Host $host;
proxy_set_header X-Forwarded-Port 443;
proxy_set_header X-Forwarded-Proto $scheme;

#this is the maximum upload size
client_max_body_size 20m;
client_body_buffer_size 128k;

proxy_connect_timeout 90;
proxy_send_timeout 90;
proxy_read_timeout 90;
proxy_request_buffering off; # Required for HTTP CLI commands in Jenkins > 2.54
proxy_set_header Connection ""; # Clear for keepalive
location ^~ /script {
return 404;

location ^~ /manage/script {
return 404;
# index index.html index.htm;

Is anything obviously wrong with these?

Best regards

David Aldrich | Consultant Engineer | NEC Telecom Modus Ltd | Olympus House, Cleeve Road, Leatherhead, Surrey, KT22 7SA, GB | t: +44 (0) 1372 381857 | m: | w: www.nec.com

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Subject Author Posted

HTTP status 500 when using Nginx with Jenkins

David Aldrich September 06, 2023 11:16AM

Re: HTTP status 500 when using Nginx with Jenkins

Francis Daly September 07, 2023 03:24PM

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