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ERROR_DS_THREAD_LIMIT_EXCEEDED
The thread limit for this request was exceeded.
ERROR_DS_THREAD_LIMIT_EXCEEDED is Win32 error 8587 (0x0000218B).
Likely impact: The DC may still answer lightweight queries while rejecting resource-intensive operations.
Typical causes
- too many concurrent expensive LDAP operations.
- one request fans out into excessive work.
- slow clients keep server work active.
- resource pressure delays worker release.
Troubleshooting steps
- Verify that the request can obtain a worker without exceeding the configured or internal thread limit.
- Collect active LDAP request count and operation type and search scope.
Useful evidence
- Collect client connection identities.
- Collect Directory Service performance counters.
Recovery and retry
Reduce concurrent or overly broad operations, cancel stale clients, and retry with bounded concurrency after worker pressure falls.
Related errors
ERROR_DS_OUT_OF_VERSION_STORE concerns retained database versions; this code concerns worker-thread capacity
Example
A client starts hundreds of subtree searches with expensive filters. Limiting concurrency and indexing the filter removes the thread-limit failures.
References
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