502 Bad Gateway after login

Support & Bugs
1

Hi Team,

Getting 502 Bad Gateway error after login. On reloading page multiple times, page sometimes load partially and give below error message:

WARNING: /var/www/html/piwik/libs/Zend/Db/Statement/Pdo.php(228): Warning - Error while sending QUERY packet. PID=17524 - Matomo 3.3.0 - Please report this message in the Matomo forums: https://forum.matomo.org (please do a search first as it might have been reported already)

Oops… there was a problem during the request. Maybe the server had a temporary issue, or maybe you requested a report with too much data. Please try again. If this error occurs repeatedly please contact your Matomo administrator for assistance.

Any help will be highly appreciated.

Thanks!

2

Hi,

The error seems to come from PDO, which doesn’t seem to be able to connect to your MySQL-server.

Maybe check this out:

https://matomo.org/faq/troubleshooting/faq_183/

3

I have already checked these configs max_allowed_packet = 2048M & wait_timeout = 86400.
I tried restarting Mysql and it just loaded page partially with header links and on reloading it again displayed same error 502 Bad Gateway.

4

I have set-up cron job for archival process and cron script looks like this:
5 * * * * www-data /usr/bin/php /var/www/html/piwik/console core:archive --url=http://domain.com/piwik/ > /home/dsuser/archive/piwik-archive.log
And I can see the archival log getting updated every hour.

The reason why I set cron job was because I was getting 502 Bad gateway errors sometime.
Now when I change date range in Visitors->Overview page, for some date range it works fine whereas it gives error again if I select more than 2-3 months in range.
ERROR:
Oops… there was a problem during the request. Maybe the server had a temporary issue, or maybe you requested a report with too much data.
Please try again. If this error occurs repeatedly please contact your Matomo administrator for assistance.
Is there anything else I can do to improve performance.

Also only after running “/etc/init.d/php7.1-fpm restart” the 502 Bad Gateway error is gone and Matomo is up and running again. Any suggestions on what can be the issue as fpm log file is empty.