Why does a 504 error occur when an administrator authorizes in Bitrix for the first time in a day?

Question

Nginx

Good afternoon!
There is a site on the Bitrix platform.
At the first authorization for the day of any administrator, the site gives a 504 error.
Moreover, this is irrelevant when authorizing from a mobile device.
Maybe someone knows what Bitrix does so hard once a day at the first authorization of the administrator in the system?
Please don't write about max_execution_time.
Thanks in advance!)

Answer 1

you can look in init.php if there is nothing.
But it is very possible that agents start running here if the agents are running on hits. Set the execution of agents to cron, and compare if there is a jamb.
Plus, since there is an error, look at the server logs, what requests are happening at that moment

Answer 2

If error logging is enabled on the server, the log should contain a specific place in the code where the site crashes due to a timeout. The specific location of the log depends on the web server (Apache / php-fast-cgi) and is specified in the corresponding config.
Perhaps you have installed some third-party modules for Bitrix?