Error map

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 · layer 3, Edge & web server

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Centre: this error. First ring: errors it is linked with (10). 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 6 · Platform & cloud
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: [eme…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…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…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…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…nginx: duplicate location — Nginx: nginx: [emerg] duplicate location "/" in /etc/nginx/sites-enabled/default:52 (Nginx / Apache)nginx: duplicate lo…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: bind() to 0.0.0.0:80 failed (13: Permission denied) — Nginx: nginx: [emerg] bind() to 0.0.0.0:80 failed (13: Permission denied) (Nginx / Apache)nginx: bind() to 0.…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…Allowed memory size exhausted — PHP Fatal error: Allowed memory size of X bytes exhausted (PHP)Allowed memory size…Maximum execution time — PHP Fatal error: Maximum execution time of 30 seconds exceeded (PHP)Maximum execution t…Call to undefined function — PHP Fatal error: Uncaught Error: Call to undefined function (PHP)Call to undefined f…ENOENT — Error: ENOENT: no such file or directory (Node.js)ENOENTEACCES — Linux: Permission denied (Linux)EACCESFileNotFoundException — java.io.FileNotFoundException: config.properties (No such file or directory) (Java)FileNotFoundExcepti…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…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 …bind() failed (98: Address already in use) — nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use) (Linux)bind() failed (98: …upstream timed out — Nginx: upstream timed out (110: Connection timed out) while reading response header from upstream (Nginx / Apache)upstream timed outChallenge failed for domain — Let’s Encrypt / Certbot: Challenge failed for domain example.com — Invalid response from http://example.com/.well-known/acme-challenge/x: 404 (SSL / TLS)Challenge failed fo…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…403 — HTTP 403 Forbidden (HTTP)403sudoers — user is not in the sudoers file. This incident will be reported. (Linux)sudoersNot allowed — WordPress: Sorry, you are not allowed to access this page. (WordPress)Not allowed

Directly related (10)

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.

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).

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 `;`.

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.

nginx: duplicate locationNginx / Apache

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

Two `location` blocks with the same match exist in one server block (often from two included files).

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: bind() to 0.0.0.0:80 failed (13: Permission denied)Nginx / Apache

Nginx: nginx: [emerg] bind() to 0.0.0.0:80 failed (13: Permission denied)

Nginx isn't allowed to bind that port — a privileged port as non-root, or SELinux restricts it.

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 (20)

Allowed memory size exhaustedPHP

PHP Fatal error: Allowed memory size of X bytes exhausted

The script tried to use more memory than PHP’s `memory_limit` allows.

Maximum execution timePHP

PHP Fatal error: Maximum execution time of 30 seconds exceeded

The script ran longer than `max_execution_time` and PHP stopped it.

Call to undefined functionPHP

PHP Fatal error: Uncaught Error: Call to undefined function

PHP can’t find the function you called — usually a missing extension, missing include, or namespace issue.

ENOENTNode.js

Error: ENOENT: no such file or directory

A file or directory the program tried to open doesn’t exist at that path.

EACCESLinux

Linux: Permission denied

Your user (or the service user) lacks read/write/execute permission on a file, directory or one of its parents.

FileNotFoundExceptionJava

java.io.FileNotFoundException: config.properties (No such file or directory)

Java couldn’t open the file — wrong path relative to the working directory, missing file, or a classpath resource read as a file.

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.

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.

bind() failed (98: Address already in use)Linux

nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)

Nginx (or another server) can’t listen on the port because another process already holds it — often Apache, another Nginx, or a s…

upstream timed outNginx / Apache

Nginx: upstream timed out (110: Connection timed out) while reading response header from upstream

Nginx waited longer than proxy_read_timeout (60 s default) for the backend (app server, PHP-FPM) to respond, then returned 504.

Challenge failed for domainSSL / TLS

Let’s Encrypt / Certbot: Challenge failed for domain example.com — Invalid response from http://example.com/.well-known/acme-challenge/x: 404

Let’s Encrypt couldn’t verify you control the domain — the HTTP-01 challenge file wasn’t served, or DNS points elsewhere.

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.

403HTTP

HTTP 403 Forbidden

The server understood the request but refuses to authorize it — you (or the server process) are not allowed to access this resour…

sudoersLinux

user is not in the sudoers file. This incident will be reported.

Your account isn’t allowed to use sudo.

Not allowedWordPress

WordPress: Sorry, you are not allowed to access this page.

Your user role lacks the capability for that admin screen — or the database table prefix / user capabilities are out of sync afte…

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