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I have a Magento 2.1.2 site hosted on Centos 7, Apache 2.4, running on PHP 7.

The site is responding with a 503 response whenever a page is requested that does not exist. For instance, articles on the old site that no longer make sense or products we no longer sell.

When a product or a CMS page exists the site works as you'd expect. It just has problems when the content does not exist.

When a 503 happens it creates an error report. The reports look like this:

a:4:{i:0;s:52:"Front controller reached 100 router match iterations";i:1;s:4069:"#0 /var/www/html/magento2/vendor/magento/framework/Interception/Interceptor.php(74): Magento\Framework\App\FrontController->dispatch(Object(Magento\Framework\App\Request\Http))
#1 /var/www/html/magento2/vendor/magento/framework/Interception/Chain/Chain.php(70): Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', Array)
#2 /var/www/html/magento2/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'requestPreproce...')
#3 /var/www/html/magento2/vendor/magento/module-store/App/FrontController/Plugin/RequestPreprocessor.php(94): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#4 /var/www/html/magento2/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Store\App\FrontController\Plugin\RequestPreprocessor->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#5 /var/www/html/magento2/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'install')
#6 /var/www/html/magento2/vendor/magento/framework/Module/Plugin/DbStatusValidator.php(69): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#7 /var/www/html/magento2/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Framework\Module\Plugin\DbStatusValidator->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#8 /var/www/html/magento2/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'front-controlle...')
#9 /var/www/html/magento2/vendor/magento/module-page-cache/Model/App/FrontController/VarnishPlugin.php(55): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#10 /var/www/html/magento2/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\PageCache\Model\App\FrontController\VarnishPlugin->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#11 /var/www/html/magento2/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'front-controlle...')
#12 /var/www/html/magento2/vendor/magento/module-page-cache/Model/App/FrontController/BuiltinPlugin.php(68): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#13 /var/www/html/magento2/vendor/magento/framework/Interception/Interceptor.php(142): Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#14 /var/www/html/magento2/var/generation/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, Array)
#15 /var/www/html/magento2/vendor/magento/framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#16 /var/www/html/magento2/vendor/magento/framework/App/Bootstrap.php(258): Magento\Framework\App\Http->launch()
#17 /var/www/html/magento2/index.php(39): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#18 {main}";s:3:"url";s:20:"/articles/wep-vs-wpa";s:11:"script_name";s:10:"/index.php";}[xxx@xxxx report]$

The error is the "Front controller reached 100 router match iterations" problem. I have tried clearing the cache, re-compiling etc but to no avail.

Can anybody suggest a way to find out what the problem is?

Update 2/12/2016 I have finally managed to get my debugging setup working. The routerList in the FrontController looks like this:

ourbrandrouter Solwin\Ourbrand\Controller\Router
standard       Magento\Framework\App\Router\Base
urlrewrite     Magento\UrlRewrite\Controller\Router
Blog           Mirasvit\Blog\Controller\Router
Core           Mirasvit\Core\Controller\Router
cms            Magento\Cms\Controller\Router
loffaq         Lof\Faq\Controller\Router
default        Magento\Framework\App\Router\DefaultRouter

Next step is to get a default site up and running and debug that to find out what is supposed to be happening but isn't in my setup.

Update 8/12/16 When PluginList.__inheritPlugins method is called with $type = "Magento/Framework/App/FrontController" using the vanilla version of the site, the following is returned in $plugins:

front-controller-builtin-cache
front-controller-varnish-cache
store-cookie-validate
install
requestProcessor

When the same method is called with the same $type using my site, the following is returned in $plugins:

front-controller-builtin-cache
front-controller-varnish-cache

Precisely why that is I don't know. Would help a lot if I knew how modules were loaded, so that I could see if that was working okay. Perhaps I should disable all third party modules to see if that narrows down the problem.

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Here the possible way to go, this error is a error already know on the Stackoverflow community

https://stackoverflow.com/questions/6262129/magento-front-controller-reached-100-router-match-iterations-error

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  • The code in question is in FrontController. It loops around until it finds a router that is able to dispatch the request or it loops 100 times and throws a LogicException. Presumably, a 404 router must be in there somewhere otherwise a URL that is not known by any router would always hit the 100 limit.
    – Jack Hughes
    Commented Nov 29, 2016 at 10:59

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