A solved answer helps future readers when it gives them a decision path, not just a final setting. Briefly describe the symptom, the check that isolated the cause, the change you made, and the result after retesting. If there were tempting but ineffective fixes, mention one so others avoid repeating it.
For example: “The failure appeared only after a proxy hop. The upstream response was valid, but the proxy timeout was shorter than the request duration. Raising that limit resolved the test case.” Keep the claim as narrow as your evidence. End with the condition a reader should verify before applying the same fix in their own environment.