How to Investigate a Hosted Website That Fails Only on One PHP Worker

If only some requests fail, one worker may have stale code, a different environment, exhausted memory, or a local connection issue. Load balancing can make the symptom intermittent.

What to check

Correlate request IDs with worker or instance identifiers, release versions, resource use, configuration, and error logs. Check whether failures follow a particular node.

Recommended next step

Repair or drain the inconsistent worker and verify all serving processes match. Informatix Systems can diagnose hosting and application reliability.