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Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.
Is it possible to update Apache within Plesk or do I need to run a command in SSH? If I need to run a command, what would the command be for Red Hat Enterprise Linux 5?
You can always grab the latest version of apache from Red hat using "yum update". Plesk itself does not use apache any more, it was replaced with lighttpd in version 9.
So to update Apache, I just enter "yum update" in SSH? Also, is lighttpd better than Apache? I like the sounds of better speed. How would I switch over from Apache to lighttpd and is there a potential of incompatibilities with various php scripts/programs?
Yes, yum update is all you need to do. I'd recommend you check this regularly, updates come out for the system all the time.
In regard to lighttpd, it is not supported in Plesk although I suspect you wouldn't have much trouble getting it to work in a plesk environment. lighttpd doesn't support things like mod_security, so I'm not particularly interested in it myself.