Given a Linux environment at the company, we are working on the introduction of monitoring tools.

I set up Apache and installed zabbix-server and prometheus server.

Open the port with firewall-cmd, start everything and make it active.
SELinux is disabled.

For some reason, the Web UI is not displayed in this state. I get a timeout. When I type the URL of the target host with wget, it says OK with 200 ...

There are no particular errors in the var/log/messages or Apache logs.

Is there any possible cause?
Sorry for the lack of information.