6729 is a transaction service result. Microsoft’s system-code table describes this value as: “The transaction cannot be enlisted on with the specified EnlistmentMask, because the transaction has already completed the PrePrepare phase. In order to ensure correctness, the ResourceManager must switch to a write- through mode and cease caching data within this transaction. Enlisting for only subsequent transaction phases may still succeed.”
Code reference and safe checks
Read the exact screen and operation before selecting a repair. This page does not run commands or collect files, keys or logs.
What this value means
Microsoft’s system-code table describes this value as: “The transaction cannot be enlisted on with the specified EnlistmentMask, because the transaction has already completed the PrePrepare phase. In order to ensure correctness, the ResourceManager must switch to a write- through mode and cease caching data within this transaction. Enlisting for only subsequent transaction phases may still succeed.”
ERROR_TRANSACTION_MUST_WRITETHROUGH is a Win32 system result, usually returned to an application or API caller. It is not a Windows blue-screen code or a diagnosis of the whole PC.
| Code | 6729 |
|---|---|
| Hex form | 0x1A49 |
| Symbol | ERROR_TRANSACTION_MUST_WRITETHROUGH |
| Windows family | Win32 system codes |
| Source level | Microsoft code and symbol entry |
Safe next steps
- For 6729 (ERROR_TRANSACTION_MUST_WRITETHROUGH), record the transaction, resource manager and application operation that failed or remained pending.
- Review the service or application transaction logs and ask the responsible administrator or vendor to verify the intended state.
- Do not assume a hardware drive failure or delete transaction logs based on the code alone.
After one step, repeat the original operation and record whether this same code returns. A different code needs a fresh interpretation.
What this code cannot prove
The source establishes the identifier and reference meaning. It does not establish the cause on your specific PC.
If the result differs from the documented message or a repair could remove data, stop and use the official source or vendor support.
Official reference and verification
Source type: Microsoft code and symbol entry. Checked against the source set on Nov 2, 2026.
The reference gives the meaning of this identifier. It does not inspect your PC or guarantee that one repair will work.