My ISP had an issue on my VPS host and did a forced shutdown and reboot. Since the reboot, settings aren't applying. ISPConfig 3.1.12 on Centos 6.10.
Debug according to https://www.faqforge.com/linux/debugging-ispconfig-3-server-actions-in-case-of-a-failure/
So ISPConfig 3.2 is not compatible CentOS 6, but 3.1.12 is? I guess I should suggest upgrading the OS too then.
Ok, I sorted out the issue was an error with crontab. Upgrading my OS is not an option as the VPS doesn't support a new enough kernel. I'm currently in the process of re-deploying on different servers, but I need to keep this production system working until then.
Will I have an issue migrating to a newer version? I'm planning on deploying a new multi-server install on Debian or Ubuntu, but it will be installed with the latest version. Will I have issues migrating from an older version? I won't be able to update and have them both on the same version.