Nginx ErrorsError
494 Request Header Too Large494 Request Header Too Large — Nginx Header Too Large
The request headers exceed Nginx's maximum header buffer size.
nginxserver
View details open() failed (13: Permission denied)Nginx cannot read the file due to filesystem permissions.
The Nginx worker process user (usually www-data or nginx) does not have read permission on the file or execute permission on the parent directories.
Fix permissions: chmod 644 for files and 755 for directories. Ensure the Nginx user can traverse the entire path. Check SELinux context.
494 Request Header Too LargeThe request headers exceed Nginx's maximum header buffer size.
connect() failed (111: Connection refused)Nginx could not connect to the upstream server.
496 SSL Certificate RequiredA client certificate is required but was not provided.
bind() to 0.0.0.0:80 failed (98: Address already in use)Nginx cannot bind to the requested address and port.
SSL_do_handshake() failedThe SSL/TLS handshake with a client or upstream server failed.
rewrite or internal redirection cycleNginx detected an infinite redirect or rewrite loop.