config

Nginx permission denied serving static files

open\(\).*failed.*Permission denied|forbidden.*directory index

Fixes

1.Ensure nginx worker process user (typically www-data/nginx) can read the files: chmod -R o+r /path
2.Check all parent directories have execute permission: chmod o+x on each directory in the path
3.Verify SELinux context if on RHEL/CentOS: restorecon -Rv /path or set httpd_sys_content_t

nginxpermissionsstatic-files

502 Bad Gateway|upstream prematurely closed connection

•Verify the upstream server is running and listening on the expected address/port
•Increase proxy_read_timeout and proxy_connect_timeout for slow backends

504 Gateway Time-?out|upstream timed out.*reading response

rewrite or internal redirection cycle|return 301.*too many redirects

•Check for conflicting rewrite rules that redirect back and forth (HTTP→HTTPS→HTTP)
•Use 'return 301' instead of 'rewrite' for simple redirects to avoid rule interaction