Upgrade from Ubuntu 22.04 to 24.04 ISPConfig3

Hello Friends,
My current server is an Ubuntu 22.04 running Nginx and ISPConfig3.
Then, I did an upgrade following this guide:
https://www.howtoforge.com/update-the-ispconfig-perfect-server-from-ubuntu-22-04-to-ubuntu-24-04/

These are my steps:
I did a release upgrade from Ubuntu 22.04 to Ubuntu 24.04 (not ISPConfig).
It is a success.
Then, I accessed my roundcube webmail. It was still working.
Then, I also accessed phpmyadmin which reported that it required php 8.2. The current version was php8.1. These result were expected because I had not changed default php version yet.

Then, I did an ISPConfig 3 update by running:
ispconfig_update.sh --force
Update is mostly successful except that the roundcube webmail and phpmyadmin are not accessible. 502 Bad Gateway
nginx/1.24.0 (Ubuntu)

I changed the default php versions as this guide and yet roundcube webmail and phpmyadmin still fails as:
502 Bad Gateway
nginx/1.24.0 (Ubuntu)

Who has experienced this failure for a similar setup: Ubuntu 22.04, Nginx, ISPConfig3?

 

I might have found the root cause!
In the app.vhost file, these lines have been commented out under directives phpmyadmin and squirrelmail!
#fastcgi_pass unix:/var/lib/php8.1-fpm/apps.sock;
and this line should have been commented out!
fastcgi_pass 127.0.0.1:9000;

Let me try again and see what happen. I have made several snapshots of my VPS.

 

Hello,
But in my case, I manually edit file apps.vhost under directives phpmyadmin and squirrelmail such that:
#fastcgi_pass 127.0.0.1:9000;
fastcgi_pass unix:/var/lib/php8.3-fpm/apps.sock;

Then, both web interfaces of roundcube and phpmyadmin work again!

I have downloaded an old copy of apps.vhost of my Ubuntu 22.04 VPS, it also contains these lines under directives phpmyadmin and squirrelmail:
#fastcgi_pass 127.0.0.1:9000;
fastcgi_pass unix:/var/lib/php8.1-fpm/apps.sock;

So, your new implementation may be a bug. or my VPS is a bit different from clean Ubuntu 24.04 ISPConfig setup?!?