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CONTEXT_E_SYNCH_TIMEOUT
CONTEXT_E_SYNCH_TIMEOUT is the failure HRESULT 0x8004E006 (signed decimal -2147164154, unsigned decimal 2147803142). Its severity bit is 1, facility is 4 (FACILITY_ITF), and the facility-specific code field is 0xE006.
Entry to the synchronized context did not complete before the applicable deadline
This HRESULT reports that a thread waited to enter a COM+ component context configured for synchronization and the wait timed out. The target method may not have started, so application telemetry must distinguish queueing at context entry from slow execution inside the method.
AllStat describes the result as “The component is configured to use synchronization and a thread has timed out waiting to enter the context.” for it, this wording identifies the immediate COM+ condition, while surrounding context and earlier events determine why it was reached.
Contract boundary
The delay is at synchronized context admission. The applicable deadline may come from surrounding transaction, call, or infrastructure policy; it should not be assumed to be a component method timeout without correlated timing.
Causes that fit this specific result
- Another call holds the activity lock for a long database, network, or blocking operation.
- A synchronized component performs excessive work before returning and releasing context admission.
- An upstream transaction or call deadline expires while the request is queued for the context.
- Contention grows because component configuration serializes work that was expected to run concurrently.
Evidence to preserve before changing the system
- Record queue-entry time, method-start time if any, activity ID, context ID, and the thread currently inside the context.
- Capture the holder stack and elapsed external calls rather than only the waiting thread.
- Measure concurrent call count and the component synchronization attribute during the incident.
- Correlate transaction timeout and RPC deadline values with the observed wait duration.
Diagnostic sequence
- Determine whether the target method began; if not, focus on the current context holder.
- Remove blocking I/O from long synchronized regions or shorten the work performed before return.
- Check whether Required synchronization is truly needed for the component state model.
- Load-test the corrected configuration using the same concurrency and transaction duration.
Retry and recovery
Reduce the held interval or contention, then retry from a clean transaction if the original request did not enter the method. Do not assume that increasing a timeout cures an unbounded holder.
What the result does not establish
The result alone does not prove a deadlock and does not reveal whether the holder is CPU-bound, blocked, or remote. It also does not establish that the business operation executed.
Difference from nearby HRESULT values
CONTEXT_E_WOULD_DEADLOCK is a cycle-prevention result. RPC_E_TIMEOUT concerns a broader RPC deadline and does not specifically identify synchronized context entry.
Practical scenario
A synchronized inventory component performs a slow remote query while holding its activity. Other callers queue at entry until their transaction deadlines expire and receive this HRESULT; the remote query is moved before the serialized state update.
Developer and telemetry guidance
Expose admission delay separately from method duration. Capacity alerts should identify the component and current holder so operators do not mistake serialization pressure for database-wide slowness.
Official Microsoft references
- Microsoft: COM transaction and context error codes
- Microsoft: COM+ synchronization concepts
- Microsoft: COM+ contexts
- Microsoft: configuring COM+ transactions
- Microsoft: HRESULT values in MS-ERREF
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