Fix Apache ERR_CONNECTION_CLOSED & worker_connections Errors

I need an experienced server administrator to help me troubleshoot and fix the "ERR_CONNECTION_CLOSED" and "worker_connections are not enough while connecting to upstream" errors on my Apache server. The server is running on Linux, and I have not made any recent changes to the configuration.

Ideal Skills:
- Extensive experience with Apache servers
- Proficient in Linux server management
- Strong troubleshooting skills

Please provide your bid if you have the necessary expertise to resolve these issues swiftly.