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  • FastCGI problems make PHP-sites crash running in IIS 10

    Nov 30, 2017 03:34 PM|RolfSnijd|LINK

    Hello expert,

    As I have ASPX-sites as well as PHP-websites, I run both flavours on my webserver IIS 10 on Windows 10 prof 32bit, latest update.

    That seems to give no problems, but the last few months I have many crashes of my PHP-sites.

    I can trace these crashes and hanging of sites to FastCGI problems.

    A summary:

    Recently, my websites running (on the same 32-bit IIS webserver) under PHP version 7.1.7 crash many times (Internal Server Error 500), or are 'frozen' in a process (Loading data...) which does not end.

    The Internal Server Error is traced back to a FastCGI problems/failures: "FastCGI exited unexpectedly".

    Sometimes, refreshing the browser-window (F5 or ctrl-R) helps, but often I have to restart my webserver entirely (hard-reboot).

    Error message:

    "HTTP Error 500.0 - Internal Server Error. The FastCGI process has failed frequently recently. Try the request again in a while."

    A. Example Piwigo (online photo album showcase):

    Clicking in album categories of Piwigo and on individual photo's for detail-page cause the same FastCGI error message.

    This happens especially when handling GIF-animations, which are resized on the fly by the Imagick-plugin.

    (The website also contains the PicLens 3D Wall plugin [Adobe Flash]).

    The Imagick-plugin in Piwigo needs C++ runtime:

    This will not work in combination with the latest version: Microsoft Visual Studio C++ 2017 Redistributable (x86) 14.10.25017

    This may work with: Microsoft Visual C++ 2015 Redistributable (x86) - 14.0.23026 , but often results in 'frozen' webserver.

    B. Example Piwik (web-statistics analysis): 

    Clicking on the webpages of Piwik, navigation towards a monitored website:

    Piwik: Settings | Websites | Manage -->

    Piwik-site page gets stuck in 'Loading data...' or displays error message:

    "HTTP Error 500.0 - Internal Server Error. The FastCGI process has failed frequently recently. Try the request again in a while."

    The statistically calculated content of the Piwigo-site (visitor activities) is often blanc in Piwik detail-pages, and sometimes filled with appropriate data.


    Overal performance: these PHP-sites have become slow and unpredictable.

    (As webbrowser, I used the updated versions of: Edge, Firefox and Opera.)

    Do you know what could be the main cause of this FastCGI problem?

    Do you know what the correct combination/implementation/settings should be, to get these websites working properly, 

    regarding versions of: Piwik, Piwigo, Imagick, Visual C++ Redistributable, PHP - FastCgi ?

    Or may the cause be: recent updates / upgrade of Windows 10 this year?

    (At the moment: 2017-11 Cumulative Update for Windows 10 Version 1703 for x86-based Systems.)

    Environment PHP-sites: 

    Piwigo 2.9.2 (www.rolfsnijders.net)

    Piwik 3.2.0 

    Operating system: WINNT: Windows 10 prof 32bit, webserver: IIS 10 

    PHP: 7.1.7 [2017-11-21]

    MySQL: 5.5.54 

    Imagick Graphics Library: External ImageMagick 7.0.5-1

    Installed on webserver: 

    a) ImageMagick-7.0.5-1-Q16-x86-dll.exe (desktop software).

    b) Relevant content of: php_imagick-3.4.3rc4-7.1-nts-vc14-x86.zip (PHP-extension).

    Friendly regards,