Hi. I have a Ubuntu 22.04 server, and I run nginx and WordPress. But I have some problems with: "nginx - upstream sent too big header while reading response header from upstream" The site gives: 502 Bad Gateway Code: 2023/05/14 10:23:32 [error] 489662#489662: *1 upstream sent too big header while reading response header from upstream, client: 5.186.54.48, server: futurenode.dk, request: "GET /wp-login.php?redirect_to=https%3A%2F%2Fwww.futurenode.dk%2Fwp-admin%2F&reauth=1 HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.2-fpm.sock:", host: "www.futurenode.dk" 2023/05/14 10:23:33 [error] 489662#489662: *1 upstream sent too big header while reading response header from upstream, client: 5.186.54.48, server: futurenode.dk, request: "GET /wp-login.php?redirect_to=https%3A%2F%2Fwww.futurenode.dk%2Fwp-admin%2F&reauth=1 HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.2-fpm.sock:", host: "www.futurenode.dk" 2023/05/14 10:24:12 [error] 489662#489662: *1 upstream sent too big header while reading response header from upstream, client: 5.186.54.48, server: futurenode.dk, request: "GET /wp-login.php?action=logout&_wpnonce=21ed9a713d HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.2-fpm.sock:", host: "www.futurenode.dk", referrer: "https://www.futurenode.dk/wp-admin/profile.php" 2023/05/14 10:24:31 [error] 489662#489662: *1 upstream sent too big header while reading response header from upstream, client: 5.186.54.48, server: futurenode.dk, request: "GET /wp-login.php?redirect_to=https%3A%2F%2Fwww.futurenode.dk%2Fwp-admin%2F&reauth=1 HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.2-fpm.sock:", host: "www.futurenode.dk" 2023/05/14 10:27:06 [error] 490164#490164: *1 upstream sent too big header while reading response header from upstream, client: 5.186.54.48, server: futurenode.dk, request: "GET /wp-login.php?redirect_to=https%3A%2F%2Fwww.futurenode.dk%2Fwp-admin%2F&reauth=1 HTTP/2.0", upstream: "fastcgi://unix:/run/php/php8.2-fpm.sock:", host: "www.futurenode.dk" My vHost look like this: Code: server { # Declare the domain name of the website server_name futurenode.dk www.futurenode.dk; # Declare the document root directory root /home/futurenode/www; client_max_body_size 500M; access_log /var/log/nginx/futurenode.dk/access.log; error_log /var/log/nginx/futurenode.dk/error.log; index index.html index.php; # Pass PHP files to PHP-FPM listening on /run/php/php8.1-fpm.sock location ~ \.php$ { try_files $uri =404; # Mitigate https://httpoxy.org/ vulnerabilities fastcgi_param HTTP_PROXY ""; fastcgi_pass unix:/run/php/php8.2-fpm.sock; fastcgi_index index.php; include fastcgi.conf; } location / { # Tune Nginx buffers # proxy_buffer_size 128k; proxy_buffers 4 256k; proxy_busy_buffers_size 256k; # rest of the nginx config below # try_files $uri $uri/ /index.php?$args; location ~* /uploads/.*\.php$ { return 503; } # Wordfence location ~ ^/\.user\.ini { deny all; } } location ~ (([^/]*)sitemap(.*)|news|author|video(.*))\.x(m|s)l$ { ## SEOPress rewrite ^.*/sitemaps\.xml$ /index.php?seopress_sitemap=1 last; rewrite ^.*/news.xml$ /index.php?seopress_news=$1 last; rewrite ^.*/video.xml$ /index.php?seopress_video=$1 last; rewrite ^.*/author.xml$ /index.php?seopress_author=$1 last; rewrite ^.*/sitemaps_xsl\.xsl$ /index.php?seopress_sitemap_xsl=1 last; rewrite ^.*/sitemaps_video_xsl\.xsl$ /index.php?seopress_sitemap_video_xsl=1 last; rewrite ^.*/([^/]+?)-sitemap([0-9]+)?.xml$ /index.php?seopress_cpt=$1&seopress_paged=$2 last; } listen [::]:443 ssl http2; # managed by Certbot listen 443 ssl http2; # managed by Certbot ssl_certificate /etc/letsencrypt/live/futurenode.dk/fullchain.pem; # managed by Certbot ssl_certificate_key /etc/letsencrypt/live/futurenode.dk/privkey.pem; # managed by Certbot #include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot ssl_ciphers ECDHE-RSA-AES256-GCM-SHA512:DHE-RSA-AES256-GCM-SHA512:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-SHA384; add_header Strict-Transport-Security "max-age=63072000; includeSubDomains; preload"; ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot } server { if ($host = www.futurenode.dk) { return 301 https://$host$request_uri; } # managed by Certbot if ($host = futurenode.dk) { return 301 https://$host$request_uri; } # managed by Certbot listen 80; listen [::]:80; server_name futurenode.dk www.futurenode.dk; return 404; # managed by Certbot } I have followed the info from this guide: https://www.howtoforge.com/nginx-up...r-while-reading-response-header-from-upstream Hope someone can help me.
Thank you for sharing your problem and its solution. Might be useful for me and others that are running Ubuntu 22.04 nginx web server as well.