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Please help me to understand the issue if my question is not related to "magento.stachexchange". Everything is fine in my magento installation but this button

Pressing “Flush Magento cache” button in admin panel leads to “Currently unable to handle this request”

Where should I look for the cause or the problem? Is it permission issue?

  • Are you getting this error from magento? or is it an error message from the webserver? a screenshot would be best to identify this. – Nidheesh Sep 22 '16 at 11:38
  • in root of site, index.php file will be there, take backup of that file & uncommnet this line ini_set('display_errors', 1); and check what error its showing after that..... also please check var/logs folder errors – Baby in Magento Sep 22 '16 at 11:38
  • @Baby in Magento, does it show the error in front-end! I do not dare do it now, I have to leave it for night time... – Zinat Sep 22 '16 at 11:43
  • @Zinat mostly i think it will show in backend, but i am not sure about it . if it is live site , you can create one demo/staging site and check , if not possible you can check in night time only. atleast check var/logs now..... – Baby in Magento Sep 22 '16 at 11:45
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    @Nidheesh, You are right, APC module is not enabled in PHP. If you have it as answer I'll accept it. Thaaaaaaaaaaaanks a looooooot – Zinat Sep 22 '16 at 12:40
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There can be different reasons for this issue. The best way to figure out the issue is "check your webserver log" which will be "/var/logs/[apache or nginx]/[the log file name configured in virtual host]".

In this case, the error message is:

FastCGI sent in stderr: "PHP message: PHP Fatal error: Call to undefined function apc_clear_cache() in /path/app/code/community/Buric/Apc/Model/Observer.php on line 13" while reading response header from upstream, client: 93.106.222.157, server: www.mydomain.com, request: "GET /index.php/admin/cache/flushSystem/key/a2a654d657aafaa937e8a‌​cdfba5540af/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "mydomain", referrer: 

Means, the magento plugin Buric_Apc is unable to perform the apc cache flush which is because, the APC module is not enabled in php or not installed on server

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