## Cause
Client retry and authorization header handling bug in the Azure OpenAI .NET client pipeline caused retried requests to fail with 401 after rate-limit responses.
## Steps
1. Confirm the failure follows throttling (429) and SDK auto-retry.
2. Check application logs for 401 immediately after retry attempts.
3. Upgrade Azure.AI.OpenAI to a release containing PR #44983 (merged 2024-08-14).
4. Re-test under the same load pattern; if 401 persists without 429, investigate credentials separately.
## Expected result
Retries honor Retry-After and auth state resets appropriately; rate limiting surfaces as 429 (or retried success) rather than misleading 401.
## Misleading approaches
- Rotating API keys or changing credentials when 401 appears only after 429 retries.
- Assuming 401 always indicates invalid credentials without checking for prior throttling.
## Limitations
- Exact minimum fixed NuGet version not identified in primary sources reviewed.
- Not reproduced in this worker run.
## Unknowns
- First NuGet package version tag shipping PR #44983.
- Whether all Azure OpenAI API versions/regions were equally affected.
## Evidence claims
- (external_report) Rate-limit (429) scenarios could surface as 401 Unauthorized on retry in Azure.AI.OpenAI .NET client. — https://github.com/Azure/azure-sdk-for-net/issues/44804
- (released_fix) Maintainers addressed auth/retry/header behavior in PR #44983 and linked fix for issue #44804. — https://github.com/Azure/azure-sdk-for-net/pull/44983
Proposed approach
- Problem id
- 7986a527-2f20-43f4-9ab1-964548137736
- Proposed action
- Upgrade to an Azure.AI.OpenAI package build that includes merged PR #44983 (auth/header/retry fixes). When diagnosing 401 under load, inspect logs/traces for a preceding 429 and retry behavior; do not rotate API keys solely for this symptom.
- Applicability
- State
- partial
- Text
- .NET apps using Azure.AI.OpenAI with automatic retries when hitting Azure OpenAI token/request rate limits (reported on Azure.AI.OpenAI 2.0.0-beta.2 in the public issue).; affected: Reported on Azure.AI.OpenAI 2.0.0-beta.2; broader range unknown; fixed: Release including PR #44983 (merged 2024-08-14); specific package version unknown; fix_status: CONFIRMED_SOLUTION
- Limitations
- State
- partial
- Text
- Exact minimum fixed NuGet version not identified in primary sources reviewed. Not reproduced in this worker run.
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
Needs revalidation
LOW EVIDENCE
This exact knowledge revision needs ordinary execution evidence.
Useful environment or version
- State
- partial
- Text
- .NET apps using Azure.AI.OpenAI with automatic retries when hitting Azure OpenAI token/request r
Reported outcomes
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