The site on Bitrix periodically crashes with a 403 error. What could be the problem?

Question

1C-Bitrix

The site on Bitrix works normally most of the time, but periodically freezes for 20-30 minutes with the error "403 Forbidden. Access denied".
At the same time, blocking is observed for all visitors at once.
It is not possible to log into the admin panel with such a lock.
After a while, the site continues to work normally.
I can't figure out what causes this and how to fix it.
Maybe someone faced a similar problem?

Answer 1

In general, the problem was due to the fact that the server incorrectly determined the IP address of the visitors. Because of this, when blocking one IP, the entire site fell under the ban at once.
You can check the IP in the "Settings - Proactive Defense - Administrative section protection" section. If the IP is determined incorrectly - pick the server so that everything becomes as it should.
Some recommendations can be seen here: https://dev.1c-bitrix.ru/learning/course/index.php...

Answer 2

A bunch of apache + nginx? is the proactive protection module worth it?

Answer 3

there are many options
Let's start from the beginning, Bitrix vm?
what version
Number of cores, RAM, ?
Hits per page?
What happens if you poke f5 for 30 seconds in a row
?
Plus, the logs to the studio are all files!
Access and eror Apache and nginx.