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502 Bad Gateway error is shown after login to Plesk or performing any actions: Connection reset by peer

Aleksandar Stoev
Updated
Plesk for Linux kb: technical ABT: Group A

Applicable to:

  • Plesk Onyx for Linux
  • Plesk for Linux

Symptoms

  • While accessing Plesk or performing any actions the following error is shown:

    CONFIG_TEXT: 502 Bad Gateway

  • The following error message appears in /var/log/sw-cp-server/error_log:

    CONFIG_TEXT: recv() failed (104: Connection reset by peer) while reading response header from upstream, client: 203.0.113.2, server: , request: "POST <some url>

    OR

    CONFIG_TEXT: [error] 17434#0: *4954 upstream sent too big header while reading response header from upstream, client: 203.0.113.2, server: , request: "GET /modules/xovi/index.php/log-analyzer/index/id/2 HTTP/1.1", upstream: "fastcgi://unix:/var/run/sw-engine.sock:", host: "example.com:8443", referrer: "https://example.com:8443/"

Cause

Low FastCGI buffer limits.

Resolution

  1. Connect to the server via SSH.

  2. Open /etc/sw-cp-server/config with a text editor:

    # vi /etc/sw-cp-server/config

  3. Increase FastCGI buffer limits using the editor:

    CONFIG_TEXT: fastcgi_buffers 32 32k;
    fastcgi_buffer_size 64k;

  4. Restart sw-cp-server and sw-engine services:

    # service sw-cp-server restart && service sw-engine restart

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Comments

1 comment
Date Votes
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    Websavers Inc

    This error occurs when logging out of Plesk on numerous servers after upgrade to 18.0.63 Update #4

    And is fixed by the above changes. Perhaps this should be default on all Plesk installs now, no?

    0

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