System admin, ubuntu 22, plesk 18

Description

Project Summary: Resolving Magento 2.4 Environment Issues and Plesk-Related Conflicts
Live Server1. Current Status: - The live version of Magento 2.4 works without any issues.
2. Problematic Behavior: - Developer instances using the exact same codebase display Error 500/503 since this morning. - Potential Cause: A recent Plesk update is suspected of causing these issues, as this has been a recurring problem after updates.
3. Cross-Domain Interference: - An unrelated domain on the same server, with a completely different codebase, also stops working unexpectedly. - Running a custom script to fix ownership and privileges in the vhost directory resolves some symptoms but does not fully address the root cause.
4. Configuration Discrepancies: - A comprehensive comparison (diff) of configuration files on the live server reveals discrepancies in Nginx/Apache, PHP-FPM, and SSL/TLS configurations, which may be contributing to the issue.
Development Server1. Current Status: - Development instances running on different servers fail to work with the same Magento 2.4 codebase that functions perfectly on the live server.
2. Problematic Behavior: - Despite adjustments in permissions, ownership, and service restarts, the development server continues to show Error 500/503.
3. Configuration Differences: - Configuration files on the development server are inherently different due to its purpose, but they seem to be misaligned with the live server setup.
Objective1. Diagnose and resolve the 500/503 errors affecting the developer instances.2. Ensure the developer instances replicate the live server environment as closely as possible while maintaining their independent configurations.3. Fix any Plesk 18-related issues causing conflicts or cross-domain interference.
Deliverables1. Fully functioning developer instances of Magento 2.4 that mirror the live environment.2. Isolation of domains on the same server to prevent cross-domain interference.3. Comprehensive documentation of the solution, highlighting: - Configuration changes. - Any Plesk-related fixes. - Steps to prevent recurrence after future Plesk updates.