CentOS

Released.

Doesn't change the fact that CentOS 6 has been EOL for nearly 3 years (Nov 2020) and there have been numerous high severity security vulnerabilities discovered since then and none of them are fixed in CentOS 6. You really need to get off it ASAP..

Yes, they were pushed to the mirrors earlier and are just showing up on the public ones now.

I would suspect that 4.10.16-25 is the fixed version. The current CentOS 7 one is 4.10.16-24 though -25 is in QA nad pending release.

You would need to make this request to Red Hat for inclusion in RHEL 7 to get it actioned. CentOS 7 is a rebuild of RHEL 7 so whatever is broken in RHEL 7 is broken in CentOS 7. Only if it is fixed in RHEL 7 will it be fixed in CentOS 7.

Well, the usual cause of problems with a web server being unable to talk to a database is due to an selinux setting that defaults to disallowing it. You can check the setting using getsebool -a | grep httpd_can_network_connect_db . If it's set to off then it is not allowed to talk to a database serv...

What is the output from aureport -a run as root? If there is an entry timestamped at the same time that you last tried the mediawiki isntall then take the number from the right hand end and plug that into ausearch -a nnnn (where nnnn is the number).

It's in the build pipeline somewhere already.

RHEL 9 has tightened security and deprecated a number of algorithms and ciphers. It's most likely that the key you are trying to use does not meet the new requirements. Try with a newer key.

I don't see the point in leaving firewall* packages installed if you have switched to using iptables or nftables. It just creates confusion for anyone that comes along later and has to work out what's in use. I'd just yum remove firewall\* and then read what it says it's going to do before replying Y.