Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteReceive the message from the correct dead-letter subqueue with Peek-Lock, diagnose and fix the cause, resend it, then complete the dead-letter copy only after the send succeeds. Where your Service Bus tier, SDK and entity configuration support it, a transaction can make sending and completing atomic. Without one, a crash between those operations can lead to a duplicate replay, so downstream processing must be idempotent.
How to resubmit a dead-letter message safely
- Choose the right dead-letter subqueue. A queue has its own DLQ; a topic message is copied to matching subscriptions, so inspect the relevant subscription DLQ. A failed auto-forward or send-via transfer may instead be in the source entity’s transfer DLQ. In .NET, select
SubQueue.DeadLetteron receiver options, orSubQueue.TransferDeadLetterfor a transfer DLQ. See Microsoft’s dead-letter queue documentation. - Receive using Peek-Lock. This keeps the message unsettled while you investigate and resend it. Do not use Receive-and-Delete when losing the message is unacceptable: a client failure after delivery can leave no recoverable source copy. Microsoft recommends Peek-Lock for workloads where message loss is unacceptable; see message transfers, locks and settlement and preventing message loss and duplicate processing.
- Inspect the failure details and correct the cause. Read
DeadLetterReasonandDeadLetterErrorDescription. Common system reasons includeMaxDeliveryCountExceeded,TTLExpiredException,HeaderSizeExceeded,Session ID is nullandMaxTransferHopCountExceeded. Replaying without fixing the underlying issue can send the message straight back to the DLQ. The configured maximum delivery count determines when repeated abandon or lock expiry dead-letters a message; Microsoft documents a default of 10 deliveries for a queue or subscription. - Resend the corrected message. For an operator-led replay, Azure portal Service Bus Explorer supports inspecting, editing, and resending individual messages or batches. For an automated workflow, receive through an SDK and send the corrected message to the intended queue or topic. Microsoft’s dead-letter queue sample, dated 2026-04-22, demonstrates retrieval, correction and resubmission.
- Complete the DLQ copy only after the send is acknowledged. In a nontransactional workflow, leave the source unsettled if sending fails. If the send succeeds but the process crashes before completing the DLQ message, Service Bus can deliver that source message again; a retry may therefore send a duplicate. Peek-Lock preserves the source for recovery, but it does not make the send and completion one atomic operation.
Choose between portal replay, separate SDK operations and a transaction
The right method depends on whether an operator or application is doing the replay, whether atomic handoff is available, and whether duplicate work is safe. A Service Bus transaction does not enlist an external database or service automatically.
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| Approach | Best fit | Recovery and duplicate trade-off | Limits |
|---|---|---|---|
| Portal Service Bus Explorer | Operator-led inspection and individual or batch replay | Inspect, edit and resend; verify the send before explicitly completing the source message. | Manual workflow. It does not guarantee exactly-once application side effects. |
| SDK: send, then complete | Automated correction logic when a transaction is unavailable or unnecessary | A failed send leaves the source unsettled. A crash after an accepted send but before source completion can result in a duplicate replay. | Requires idempotent business handling and operational visibility into retries and settlement. |
| SDK transaction or supported send-via transfer | Automated handoff where the tier, SDK, entities and configuration support transactions | Can atomically couple the destination send and source completion. | Basic tier and JavaScript SDK do not support transactions. Cross-entity transactions require client configuration, and a transaction times out after two minutes. |
Microsoft documents transactional send and settlement in its Service Bus transaction overview. Check support for your actual SDK and entity path before relying on atomicity; transaction support is not universal across tiers and configurations.
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Peek-Lock permits redelivery, and acknowledgments can be lost. A stable application business key or MessageId can help consumers recognize work they have already performed. Broker duplicate detection is a separate, limited safeguard: it checks repeated MessageId values—or MessageId plus partition key when partitioning applies—within a configured history window. A repeated send inside that window may be acknowledged but dropped; this does not replace idempotent consumer logic. Microsoft documents a 10-minute default history window, configurable from 20 seconds to 7 days, and notes that duplicate detection can affect throughput. See Azure Service Bus duplicate message detection.
#1 Best Overall
Account for locks and session ordering
Allow enough time to process under Peek-Lock
Microsoft documents a default Peek-Lock duration of one minute and a maximum of five minutes. Renew the lock if diagnosis and resend take longer; an expired lock can allow redelivery while your process is still working. Lock duration and renewal behavior are described in Message transfers, locks, and settlement.
Do not expect session replay to restore its old position
A resubmitted session message receives a new enqueue time and sequence number, so it does not regain its former position in the session’s order. If ordering matters, sequence replay using business data or reconcile the order explicitly. See Microsoft’s session documentation.
Rank #2
What the DLQ retains—and what replay cannot guarantee
Dead-letter queues are subqueues of queues or topic subscriptions, not independent entities, and their messages remain until retrieved and completed. Microsoft states, “There’s no automatic cleanup of the DLQ.” DLQ messages do not observe TTL. Dead-letter causes include delivery-count exhaustion, expiry when configured, filter evaluation errors and transfer failures; inspect the actual reason before replaying. These behaviors are covered in Service Bus Dead-Letter Queues.
The Tool Desk
Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →A successful broker send and completion do not make a database update, API call or other external side effect atomic with Service Bus settlement. Transactions only cover supported Service Bus operations; arbitrary downstream work still needs its own idempotency and recovery design. The safest practical goal is to retain a recoverable source until the broker accepts the resend, use a Service Bus transaction when it is supported and appropriate, and make repeated application work harmless.
For new implementations, use current Azure SDK libraries and check Microsoft’s current support guidance: the documentation notes retirement of legacy Service Bus SDKs and SBMP on 2026-09-30.
Quick Recap
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