Issue Webserver / websites slow

[dennygoosensen]

Server operating system version

CentOS 7

Plesk version and microupdate number

18.0.41

Hi,

I have a plesk webserver on linux:
Plesk Obsidian Web Pro Edition
Versie 18.0.41 Update #1

Since a couple of weeks I have a problem (I never had this before). After a couple of days the webserver is very slow, loading time is long. When turn ON the firewall and the Turn it OFF again fixes my problem.

At 09:14 the problem starts
At 09:15:32 I turn ON the firewall
A few seconds later I turn OFF the firewall
After this my problem disappeared

Does anyone now what causing this problem?

My log file: https://www.flinqproducts.nl/wp-content/uploads/2022/08/Log-file.txt

 

[Nikolay]

I can suggest you try the following:
- install updates as the latest version of Plesk is 18.0.46
- when the server is slow, check process usage using 'top' command and check which process consumes CPU, then check logs regarding this process/service to find more details about it
- try to check how many rules do you have for the firewall: iptables -L
- if you have fail2ban enabled, you can try to check this service