{"record":{"id":"a42b9e9bfc053517","repo":"unslothai/unsloth","slug":"could-not-reach-chatgpt-codex","errorCode":null,"errorMessage":"Could not reach ChatGPT Codex.","messagePattern":"Could not reach ChatGPT Codex\\.","errorType":"exception","errorClass":"CodexTransportError","httpStatus":null,"severity":"error","filePath":"studio/backend/core/inference/openai_codex_client.py","lineNumber":414,"sourceCode":"                        yield None\n                        return\n                    continue\n                if response.status_code == 429:\n                    raise CodexQuotaError(\n                        \"ChatGPT subscription quota is temporarily unavailable.\",\n                        status = 429,\n                        metadata = _quota_metadata(response),\n                    )\n                suffix = f\" {detail}\" if detail else \"\"\n                raise CodexTransportError(\n                    f\"ChatGPT Codex request failed ({response.status_code}).{suffix}\",\n                    status = response.status_code,\n                )\n        except httpx.HTTPError as exc:\n            if yielded:\n                raise\n            if attempt >= _MAX_TRANSIENT_RETRIES:\n                raise CodexTransportError(\"Could not reach ChatGPT Codex.\") from exc\n            await _retry_pause(float(2**attempt), cancel_event)\n            if cancel_event is not None and cancel_event.is_set():\n                yield None\n                return\n    raise CodexTransportError(\"Could not reach ChatGPT Codex.\")\n\n\nclass OpenAICodexClient:\n    def __init__(\n        self,\n        access_token: str,\n        account_id: str,\n        *,\n        refresh_access: Callable[[], Awaitable[tuple[str, str]]] | None = None,\n    ) -> None:\n        self._token, self._account_id = access_token, account_id\n        self._refresh_access = refresh_access\n        self._client = _create_http_client()","sourceCodeStart":396,"sourceCodeEnd":432,"githubUrl":"https://github.com/unslothai/unsloth/blob/203007d19051dcd2ae33876786d117c99f6b0368/studio/backend/core/inference/openai_codex_client.py#L396-L432","documentation":"Raised when an httpx.HTTPError (connect failure, DNS error, TLS error, read timeout) occurs, the response was never yielded, and the attempt counter has reached _MAX_TRANSIENT_RETRIES. It is the terminal 'cannot reach the endpoint at all' error after exponential backoff (2**attempt seconds between tries).","triggerScenarios":"Every attempt in the retry loop raises httpx.HTTPError before a response arrives: DNS resolution failure, connection refused, TLS handshake error, or read timeout — with attempts exhausted.","commonSituations":"Offline machine; firewall blocking egress to the Codex endpoint; DNS misconfiguration; VPN dropped mid-session; endpoint temporarily unreachable for longer than the full backoff window.","solutions":["Verify network egress to the Codex endpoint (curl/DNS lookup) from the same host","Check firewall/proxy/VPN rules for the endpoint domain","If truly transient, catch CodexTransportError with this message and retry later with a longer outer backoff"],"exampleFix":null,"handlingStrategy":"retry","validationCode":"import httpx, socket\n\ndef codex_endpoint_reachable(base_url: str) -> bool:\n    host = httpx.URL(base_url).host\n    try:\n        socket.gethostbyname(host)\n        return True\n    except socket.gaierror:\n        return False","typeGuard":null,"tryCatchPattern":"try:\n    async for chunk in stream:\n        ...\nexcept CodexTransportError as exc:\n    if 'Could not reach ChatGPT Codex' in str(exc):\n        await offline_backoff_then_retry(request)  # long outer backoff\n    raise","preventionTips":["Pre-flight DNS/egress check in health checks so failures surface before user requests","Size outer retry budgets larger than the client's internal _MAX_TRANSIENT_RETRIES backoff window","Monitor network transitions (VPN/dock changes) in long-running apps"],"tags":["network","codex","connectivity","retry"],"backgroundTag":null,"analyzedSha":"203007d19051dcd2ae33876786d117c99f6b0368","analyzedAt":"2026-08-15T02:48:39.846Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}