| 500 Internal Server Error | Apache HTTP Server Error Code 500: How to Fix It | high | Medium |
| 502 Bad Gateway | Apache HTTP Server Error Code 502 Bad Gateway: How to Fix It | high | Medium |
| 503 Service Unavailable | Apache HTTP Server Error Code 503: How to Fix It | high | Medium |
| 504 Gateway Timeout | Apache HTTP Server Error Code 504 Gateway Timeout: How to Fix It | high | Medium |
| AH00072 make_sock could not bind to address | Apache HTTP Server Error Code AH00072: How to Fix It | high | Medium |
| AH00558 Could Not Reliably Determine Server FQDN | Apache HTTP Server Error Code AH00558: How to Fix It | low | Easy |
| AH01630 client denied by server configuration | Apache HTTP Server Error Code AH01630: How to Fix It | medium | Medium |
| MaxRequestWorkers Reached | Apache HTTP Server MaxRequestWorkers Reached Error: How to Fix It | high | Medium |