Website Service Unavailable

[kulot]

We are experiencing this "Service Unavailable" error in our Joomla 3.5 website.

The error will appear when we have 500 or more current online users.

Before it will appear, when browsing the website we noticed that it is very slow to load.

Current setup that might help:

Server has 16 virtual core and 12gb of memory and the php fastcgi maxintances are 8

Is there any settings that we need to tweak to cater high volume users?

Below is the processes

[itoctopus]

Have you checked the MySQL slow query log? Also, are you using InnoDB or MySQL? And, if InnoDB is used, have you optimized it for your Joomla website?

[leolam]

What is the exact 503-error you get?

Leo

[kulot]

Have you checked the MySQL slow query log? Also, are you using InnoDB or MySQL? And, if InnoDB is used, have you optimized it for your Joomla website?

We are using mySQL and there are no slow query log and I think this is not with the database connection because even a simple code like below is not running

<?php
echo date("l jS \of F Y h:i:s A");
?>

however, it can display static html file

[kulot]

What is the exact 503-error you get?

Leo

Just a white page with the words "Service Unavailable"

[leolam]

Please post your server environment FPA output and I like to confirm you are running IIS? http://forum.joomla.org/viewtopic.php?f=621&t=582860

Leo

[kulot]

[08-Jan-2017 10:36:37 Asia/Muscat] PHP Fatal error: WINCACHE: lock_readlock: acquired abandoned mutex FILELIST_CACHE_1_0_626576_A. Something bad happend in another process! in C:\inetpub\wwwroot\libraries\loader.php on line 640

Joomla! Instance :: .- ()
Joomla! Configured :: Yes | Read-Only (444) | Owner: 0 (uid: /gid: ) | Group: 0 (gid: ) | Valid For: 1.5
Configuration Options :: Offline: 0 | SEF: 1 | SEF Suffix: 0 | SEF ReWrite: 1 | .htaccess/web.config: Yes | GZip: 0 | Cache: 1 | FTP Layer: 0 | SSL: 0 | Error Reporting: none | Site Debug: 0 | Database Credentials Present: Yes

Host Configuration :: OS: Windows NT | OS Version: 6.2 | Technology: i586 | Web Server: Microsoft-IIS/8.0 | Encoding: gzip, deflate | Doc Root: C:/inetpub/wwwroot/ | System TMP Writable: Yes

PHP Configuration :: Version: 5.6.0 | PHP API: cgi-fcgi | Session Path Writable: Yes | Display Errors: 1 | Error Reporting: 22527 | Log Errors To: C:\Windows\temp\PHP56_errors.log | Last Known Error: 08th January 2017 10:36:37. | Register Globals: | Magic Quotes: | Safe Mode: | Open Base: | Uploads: 1 | Max. Upload Size: 32M | Max. POST Size: 32M | Max. Input Time: 60 | Max. Execution Time: 300 | Memory Limit: 512M

MySQL Configuration :: Version: 5.1.70-community (Client:mysqlnd 5.0.11-dev - 20120503 - $Id: f373ea5dd5538761406a8022a4b8a374418b240e $) | Host: --protected-- (--protected--) | Collation: utf8_general_ci (Character Set: utf8) | Database Size: 53.83 MiB | #of Tables:  124

PHP Extensions :: Core (5.6.0) | bcmath () | calendar () | ctype () | date (5.6.0) | ereg () | filter (0.11.0) | ftp () | hash (1.0) | iconv () | json (1.2.1) | mcrypt () | SPL (0.2) | odbc (1.0) | pcre () | Reflection ($Id: 8e5fcadef43ea0f77c7886557613923e30b979dd $) | session () | standard (5.6.0) | mysqlnd (mysqlnd 5.0.11-dev - 20120503 - $Id: f373ea5dd5538761406a8022a4b8a374418b240e $) | tokenizer (0.1) | zip (1.12.4) | zlib (2.0) | libxml () | dom (20031129) | PDO (1.0.4dev) | openssl () | SimpleXML (0.1) | wddx () | xml () | xmlreader (0.1) | xmlwriter (0.1) | cgi-fcgi () | mysql (1.0) | mysqli (0.1) | mbstring () | gd () | gettext () | curl () | exif (1.4 $Id: 0b28f1c2604848245c00549a8c8055a1c0d22a49 $) | xmlrpc (0.51) | Phar (2.0.2) | soap () | pdo_mysql (1.0.2) | pdo_sqlite (1.0.1) | imap () | tidy (2.0) | pdo_sqlsrv (3.2.0.0) | sqlsrv (3.2.0.0) | wincache (1.3.6.2) | ldap () | mhash () | Zend Engine (2.6.0) |
Potential Missing Extensions :: suhosin |

Switch User Environment (Experimental) :: PHP CGI: Yes | Server SU: No | PHP SU: Yes | Custom SU (LiteSpeed/Cloud/Grid): Yes
Potential Ownership Issues: No

Core Folders :: images/ (777) | components/ (777) | modules/ (777) | plugins/ (777) | language/ (777) | templates/ (777) | cache/ (777) | logs/ (777) | tmp/ (777) | administrator/components/ (777) | administrator/modules/ (777) | administrator/language/ (777) | administrator/templates/ (777) |

Elevated Permissions (First 10) :: administrator/ (777) | administrator/cache/ (777) | administrator/cache/_system/ (777) | administrator/cache/com_languages/ (777) | administrator/cache/com_modules/ (777) | administrator/cache/com_plugins/ (777) | administrator/cache/fof/ (777) | administrator/components/ (777) | administrator/components/com_admin/ (777) | administrator/components/com_admin/controllers/ (777) |

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[leolam]

See if some solutions offered here help you https://social.msdn.microsoft.com/Forum ... tespreview

and more likely

https://forums.iis.net/t/1210919.aspx?H ... t+for+Info

If you have the option update your PHP version. That is EOL and support will seize by end of the year

Leo

[kulot]

Just an additional info and only discovered today. When the website returns 500. Event a simple php <?PHP echo date("l jS \of F Y h:i:s A");?> will not run but index.html will run.

So my suspect is that PHP fastcgi is no longer functioning

[TCoder]

Out of the box IIS, without adjustments has some limitations.

In your machine.config increase.

Code: Select all

 <processModel requestQueueLimit="100000" maxWorkerThreads="100" maxIoThreads="100" minWorkerThreads="50" minIoThreads="50" />

in the registry you can increase..

Code: Select all

reg add HKLM\System\CurrentControlSet\Services\HTTP\Parameters /v MaxConnections /t REG_DWORD /d 1000000

in your applicationhost.config

Code: Select all

appcmd.exe set config /section:serverRuntime /appConcurrentRequestLimit:100000

You need to line up everything, you also need to change the application pool it runs under and increase that as well.

By making the queue length higher.

500 users shouldn't trigger this, because that's more like 1k simultaneous connections, normally the default out of the box is configured to 5000.

But, if you're running other things on the server, you might hit those limits.