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Websites on Plesk server are slow or show error 500 or PHP mail cannot be sent: ap_pass_brigade failed

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Yaroslav Tarasov
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Plesk for Linux kb: technical ABT: Group A FR:PPM-2764

Applicable to:

  • Plesk for Linux

Symptoms

  • Websites on Plesk server are slow or not available, sending emails via PHP script fails with:

    CONFIG_TEXT: 500 Internal server error

  • Domains > exemple.com > Logs or /var/www/vhosts/example.com/logs/error_log show:

    CONFIG_TEXT: mod_fcgid: ap_pass_brigade failed in handle_request_ipc function, referer: http://www.example.com/index.php

Cause

The connection is being reset due to the FcgidMaxRequestsPerProcess limit has been reached. The parameter was previously defined in the web configuration:

  • On RedHat/CentOS/CloudLinux:

    # grep FcgidMaxRequestsPerProcess /etc/httpd/conf.d/fcgid.conf /var/www/vhosts/system/example.com/conf/vhost.conf /var/www/vhosts/system/example.com/conf/httpd.conf

  • On Ubuntu/Debian:

    # grep FcgidMaxRequestsPerProcess /etc/apache2/mods-enabled/fcgid.conf /var/www/vhosts/system/example.com/conf/vhost.conf /var/www/vhosts/system/example.com/conf/httpd.conf

Resolution

Solution for one particular domain

  1. Log in to Plesk.

  2. Go to Domains > example.com > Apache & nginx Settings > Additional Apache directives.

  3. Increase the FcgidMaxRequestsPerProcess parameter value in Additional directives for HTTP and Additional directives for HTTPS fields:

    CONFIG_TEXT: <IfModule mod_fcgid.c>
    FcgidMaxRequestsPerProcess 500
    </IfModule>

Solution for all domains on the server

  1. Connect to the server via SSH.

  2. Open /etc/httpd/conf.d/fcgid.conf (on RedHat/CentOS/CloudLinux) or /etc/apache2/mods-enabled/fcgid.conf (on Ubuntu/Debian) using "vi";

  3. Increase the value of FcgidMaxRequestsPerProcess parameter, e.g. to 500:

    CONFIG_TEXT: <IfModule mod_fcgid.c>
    FcgidMaxRequestsPerProcess 500
    </IfModule>

  4. Reload Apache configuration:

    • On RedHat/CentOS/CloudLinux:

      # systemctl reload httpd

    • On Ubuntu/Debian:

      # systemctl reload apache2

  5. If it does not help, set FcgidOutputBufferSize 0 in the same configuration file and reload Apache again.

Comments

4 comments

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  • Avatar
    Prodesignerch

    Hello, i tried resolution 1, but second step resulted in command unknown. Also, problem is still there.,

    Could you please check this?

    log is below. 

    thanks

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  • Avatar
    Anzhelika Khapaknysh

    Hi!

    In case Debian/Ubuntu is running on the server, run the following command:

    # service apache2 reload

    If it won't help, I recommend you creating a ticket so we can check the issue in details: https://support.plesk.com/hc/en-us

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  • Avatar
    Leandro Ferrero

    I have tried both solutions, but didn't work for me.

    I have Plesk Onyx 17.0.17 and i have tried increasing with this parameters:

    FcgidIOTimeout 1800
    FcgidIdleTimeout 1800
    FcgidMaxRequestsPerProcess 500

    On PHP

    set_time_limit(0);
    ignore_user_abort(true);

    But the PHP Script return error 500 after 1 minute...

    Right after that i can see this on the logs:

    [fcgid:warn] [pid 29685] (32)Broken pipe: [client xxx.xxx.xxx.xxx:yyyyy] mod_fcgid: ap_pass_brigade failed in handle_request_ipc function

     

     

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  • Avatar
    Ivan Postnikov

    @Leandro Ferrero

    Hi!

    As the error appears after 1 minute, it seems the specified limits are not used.
    Make sure you have restarted Apache:

    # service httpd reload

    or

    # service apache2 reload

    In case the issue persists, consider contacting Plesk Support.

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