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Website shows 500 internal server error on Plesk: mod_fcgid: read data timeout

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Alexander Tsmokalyuk
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Applicable to:

  • Plesk for Linux

Symptoms

  • A website is not loading and "500 internal server error" is being shown after ~30-60 seconds.

  • The following error can be observed in the domain error log /var/www/vhosts/example.com/logs/error_log file:

    CONFIG_TEXT: [warn] mod_fcgid: read data timeout in 45 seconds, referer: http://www.example.com/admin/orders.php
    [error] Premature end of script headers: PDF.php, referer: http://www.example.com/admin/orders.php

    OR:

    The following error can be found in /var/log/apache2/error.log :

    CONFIG_TEXT: [warn] mod_fcgid: process 16576 graceful kill fail, sending SIGKILL

    OR

    The following error is produced in /var/www/vhosts/system/example.com/logs/proxy_error_log:

    CONFIG_TEXT: connect() failed (111: Connection refused) while connecting to upstream

Cause

The FcgidIOTimeout value - the maximum period of time the module will wait while trying to read from or write to a FastCGI application - has been exceeded.

Resolution

Increase the parameter value or optimize FastCGI application.

FcgidIOTimeout parameter for a domain is set to the same value as max_execution_time PHP parameter.

  1. Log into Plesk UI.
  2. Set "max_execution_time" to "120" in Plesk > Domains > example.com > PHP settings

  3. Increase "FastCGI" timeout by adding the following Apache dirctives in Plesk > Domains > example.com > Apache & Nginx settings > Additional Apache directives:

    CONFIG_TEXT: <IfModule mod_fcgid.c>
    FcgidIOTimeout 120
    </IfModule>

Optionally, switch the domain to FPM handler at Domains > example.com > PHP Settings.

Comments

5 comments

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  • Avatar
    Christian

    Hello,

    When I paste the code in Additional nginx directives the code is red and I think this is wrong. My webmail is still slow from time to time. What can I do ?

    Can you help ?

    Regards
    Kris

    Configuration :
    Ubuntu 14.04.5 LTS
    Plesk Onyx Version 17.8.11 Update #18

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  • Avatar
    Anzhelika Khapaknysh

    Hi @Christian!

    Directives which are mentioned in the article, are designed for Apache web server, thus they can be added in following fields only:

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  • Avatar
    Christian

    In fact the problem was that I had too many connexions from users (my customers) using the webmail or at least postfix.
    I hire a guy that found that I should modify /etc/courier-imap/imapd

    He changed MAXDAEMONS to more that it was.

    MAXDAEMONS=128

    I hope that this can help anybody. Since that no more problems with error 500 or slow login in the webmail or anything slow using the webmail.

    share

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  • Avatar
    Anzhelika Khapaknysh

    Christian,

    Glad to know the issue has been fixed!

    Just for your reference, the same solution is described in this article.

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  • Avatar
    Christian

    Thanks a lot

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