Error map

nginx: duplicate location Nginx: nginx: [emerg] duplicate location "/" in /etc/nginx/sites-enabled/default:52

Nginx / Apache · layer 3, Edge & web server

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Centre: this error. First ring: errors it is linked with (7). Outer ring: what those are linked with. Colours show the layer of a request each error belongs to. Click any dot to re-centre the map on it; hover to follow its connections. The centre dot opens the error page.

1 · On your device 2 · Network 3 · Edge & web server 4 · Application & API
nginx: duplicate location — Nginx: nginx: [emerg] duplicate location "/" in /etc/nginx/sites-enabled/default:52 (Nginx / Apache)nginx: dupl…nginx: directive is not terminated by ";" — Nginx: nginx: [emerg] directive "proxy_pass" is not terminated by ";" in /etc/nginx/sites-enabled/app:15 (Nginx / Apache)nginx: directive is…Welcome to nginx! shown instead of my site — Browser: Welcome to nginx! If you see this page, the nginx web server is successfully installed and working (Nginx / Apache)Welcome to nginx! s…no "ssl_certificate" is defined for the "listen ... ssl" directive — Nginx: [emerg] no "ssl_certificate" is defined for the "listen ... ssl" directive in /etc/nginx/sites-enabled/default:3 (SSL / TLS)no "ssl_certificate…nginx: [emerg] unexpected end of file, expecting ";" or "}" — Nginx: nginx: [emerg] unexpected end of file, expecting ";" or "}" in /etc/nginx/conf.d/site.conf:42 (Nginx / Apache)nginx: [emerg] unex…nginx: conflicting server name ignored — Nginx: nginx: [warn] conflicting server name "example.com" on 0.0.0.0:80, ignored (Nginx / Apache)nginx: conflicting …nginx: [emerg] open() failed (2: No such file or directory) — Nginx: nginx: [emerg] open() "/etc/nginx/snippets/fastcgi-php.conf" failed (2: No such file or directory) in /etc/nginx/sites-enabled/app:20 (Nginx / Apache)nginx: [emerg] open…could not build the server_names_hash, you should increase server_names_hash_bucket_size — Nginx: nginx: [emerg] could not build the server_names_hash, you should increase server_names_hash_bucket_size: 64 (Nginx / Apache)could not build the…Parse error — PHP Parse error: syntax error, unexpected … (PHP)Parse errornginx: [emerg] unknown directive — Nginx: nginx: [emerg] unknown directive "x" in /etc/nginx/sites-enabled/x:12 — configuration file test failed (Nginx / Apache)nginx: [emerg] unkn…AH00526: Syntax error on line of apache config — Apache: AH00526: Syntax error on line 12 of /etc/apache2/sites-enabled/site.conf: Invalid command 'Foo', perhaps misspelled or defined by a module not included in the server configuration (Nginx / Apache)AH00526: Syntax err…nginx: client intended to send too large body — Nginx: [error] client intended to send too large body: 5242880 bytes (413 Request Entity Too Large) (Nginx / Apache)nginx: client inten…directory index of "/var/www/" is forbidden — Nginx: [error] directory index of "/var/www/html/" is forbidden (403 Forbidden) (Nginx / Apache)directory index of …AH00112: DocumentRoot does not exist — Apache: AH00112: Warning: DocumentRoot [/var/www/example.com/public_html] does not exist (Nginx / Apache)AH00112: DocumentRo…ERR_SSL_PROTOCOL_ERROR — ERR_SSL_PROTOCOL_ERROR (This site can't provide a secure connection) (JavaScript)ERR_SSL_PROTOCOL_ER…tlsv1 unrecognized name (SNI) — OpenSSL: SSL alert number 112 — tlsv1 unrecognized name (SSL / TLS)tlsv1 unrecognized …SSL_CTX_use_PrivateKey_file failed (key values mismatch) — Nginx: [emerg] SSL_CTX_use_PrivateKey_file("/etc/ssl/server.key") failed (SSL: error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch) (SSL / TLS)SSL_CTX_use_Private…nginx: invalid PID number in nginx.pid — Nginx: nginx: [error] invalid PID number "" in "/run/nginx.pid" (when running nginx -s reload) (Nginx / Apache)nginx: invalid PID …Cannot redeclare — Fatal error: Cannot redeclare function foo() (previously declared in …) (PHP)Cannot redeclarefailed to open stream — Warning: include(x.php): Failed to open stream: No such file or directory (PHP)failed to open stre…Could not automatically find a matching server block — Certbot: Could not automatically find a matching server block for example.com. Set the `server_name` directive to use the Nginx installer (SSL / TLS)Could not automatic…

Directly related (7)

nginx: directive is not terminated by ";"Nginx / Apache

Nginx: nginx: [emerg] directive "proxy_pass" is not terminated by ";" in /etc/nginx/sites-enabled/app:15

A directive's arguments run into the next line because the `;` is missing (or a quote is unbalanced).

Welcome to nginx! shown instead of my siteNginx / Apache

Browser: Welcome to nginx! If you see this page, the nginx web server is successfully installed and working

Requests are served by the default server block, not your site's block.

no "ssl_certificate" is defined for the "listen ... ssl" directiveSSL / TLS

Nginx: [emerg] no "ssl_certificate" is defined for the "listen ... ssl" directive in /etc/nginx/sites-enabled/default:3

A server block listens with `ssl` but has no `ssl_certificate` and `ssl_certificate_key`.

nginx: [emerg] unexpected end of file, expecting ";" or "}"Nginx / Apache

Nginx: nginx: [emerg] unexpected end of file, expecting ";" or "}" in /etc/nginx/conf.d/site.conf:42

The config ends while a block or directive is still open — a missing `}` or `;`.

nginx: conflicting server name ignoredNginx / Apache

Nginx: nginx: [warn] conflicting server name "example.com" on 0.0.0.0:80, ignored

Two server blocks listen on the same port with the same `server_name`; the second is ignored.

nginx: [emerg] open() failed (2: No such file or directory)Nginx / Apache

Nginx: nginx: [emerg] open() "/etc/nginx/snippets/fastcgi-php.conf" failed (2: No such file or directory) in /etc/nginx/sites-enabled/app:20

The config includes a file (snippet, certificate, ssl option file) that doesn't exist.

could not build the server_names_hash, you should increase server_names_hash_bucket_sizeNginx / Apache

Nginx: nginx: [emerg] could not build the server_names_hash, you should increase server_names_hash_bucket_size: 64

A very long `server_name` (or many names) doesn't fit the hash bucket.

Two steps away (13)

Parse errorPHP

PHP Parse error: syntax error, unexpected …

PHP can’t parse the file because of a syntax mistake — the real error is often on the line before the one reported.

nginx: [emerg] unknown directiveNginx / Apache

Nginx: nginx: [emerg] unknown directive "x" in /etc/nginx/sites-enabled/x:12 — configuration file test failed

Nginx found a directive it doesn’t know — a typo, a missing semicolon on the previous line, a directive from a module that isn’t…

AH00526: Syntax error on line of apache configNginx / Apache

Apache: AH00526: Syntax error on line 12 of /etc/apache2/sites-enabled/site.conf: Invalid command 'Foo', perhaps misspelled or defined by a module not included in the server configuration

Apache's config has a syntax problem or a directive from a module that isn't loaded.

nginx: client intended to send too large bodyNginx / Apache

Nginx: [error] client intended to send too large body: 5242880 bytes (413 Request Entity Too Large)

A request body exceeded `client_max_body_size` (default 1 MB), so Nginx returned 413 before reaching your app.

directory index of "/var/www/" is forbiddenNginx / Apache

Nginx: [error] directory index of "/var/www/html/" is forbidden (403 Forbidden)

A directory was requested but no index file exists (or index is wrong) and autoindex is off, so Nginx returns 403.

AH00112: DocumentRoot does not existNginx / Apache

Apache: AH00112: Warning: DocumentRoot [/var/www/example.com/public_html] does not exist

A virtual host points to a directory that doesn't exist.

ERR_SSL_PROTOCOL_ERRORJavaScript

ERR_SSL_PROTOCOL_ERROR (This site can't provide a secure connection)

The browser couldn’t negotiate TLS — the server sent an invalid response, often plain HTTP on the HTTPS port.

tlsv1 unrecognized name (SNI)SSL / TLS

OpenSSL: SSL alert number 112 — tlsv1 unrecognized name

The server did not recognise the hostname sent in SNI and rejected the handshake (or an alert/warning is logged).

SSL_CTX_use_PrivateKey_file failed (key values mismatch)SSL / TLS

Nginx: [emerg] SSL_CTX_use_PrivateKey_file("/etc/ssl/server.key") failed (SSL: error:0B080074:x509 certificate routines:X509_check_private_key:key values mismatch)

The private key does not belong to the certificate configured in the server.

nginx: invalid PID number in nginx.pidNginx / Apache

Nginx: nginx: [error] invalid PID number "" in "/run/nginx.pid" (when running nginx -s reload)

Nginx can't signal the master process because the PID file is empty, stale or missing.

Cannot redeclarePHP

Fatal error: Cannot redeclare function foo() (previously declared in …)

The same function (or class) was defined twice — usually a file included more than once.

failed to open streamPHP

Warning: include(x.php): Failed to open stream: No such file or directory

PHP couldn’t open a file for include/require/fopen — wrong path, missing file, or no permission.

Could not automatically find a matching server blockSSL / TLS

Certbot: Could not automatically find a matching server block for example.com. Set the `server_name` directive to use the Nginx installer

Certbot's Nginx plugin could not find a `server` block whose `server_name` matches the domain you requested.

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