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Recovering from Minor LSA Corruption
Article ID: 199071 - View products that this article applies to.
This article was previously published under Q199071
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
You might see event ID 5714
on the primary domain controller (PDC), or event ID 5716
The full synchronization request from the server "bdc" failed with the following error: error text
on one or more backup domain controllers (BDCs), indicating that replication of the LSA database failed.
The partial synchronization replication of the SAM database from the primary domain controller name failed with the following error: Cannot perform this operation on built-in accounts
This problem occurs because one of the secrets in the LSA database is corrupted. This can happen when the registry is physically corrupted (as in a disk system hardware failure) or when a transaction to the LSA database does not complete and is left in a partially completed state (as in a power failure during a transaction).
If you examine the LSA secrets in the registry, you will see at least one secret that has only one subkey, PolMod. Normal secrets have five subkeys.
To resolve this problem, locate and delete the corrupted secret in the registry on the PDC.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
If you examine each secret in the registry, you can locate the corrupted secret manually and no reboot will be required.
You can also find the corrupted secret by installing a checked build of Netlogon.dll and examining the logs that are generated. A Netlogon.log file of this problem will have lines (wrapped for readability) that look like:
12/08 18:11:41 [SYNC] Packing Secret Object: G$$TRUSTEDDOMAINFrom this log, you can see that the LSA secret named G$$TRUSTEDDOMAIN is corrupted.
12/08 18:11:41 [CRITICAL] NlSyncLsaDatabase: returning unsuccessful (c0000034).
12/08 18:11:41 [MISC] Eventlog: 5714 (2) "PDC" "%%2" c0000034
12/08 18:11:41 [SYNC] NetrDatabaseSync: LSA returning (0xc0000034) to PDC Context: 0x0.
For more information on obtaining, installing and configuring the checked build of Netlogon.dll, contact Microsoft Product Support Services.
After the corrupted secret is located, delete it.
NOTE: Performing the following procedure across a slow WAN link could be extremely time-consuming (hours). Microsoft recommends that you perform this procedure locally on the PDC.
Here is a short list of secrets you might see:
Problems of this sort occur only in global secrets because other secrets are not replicated to BDCs by Netlogon. Thus, it is only necessary to inspect secrets beginning with G$.
Collapse this tableExpand this table
LSA secrets are stored in the registry under the following registry key:
HKEY_LOCAL_MACHINE\Security\Policy\SecretsEach LSA secret key will normally have five subkeys:
CupdTime CurrVal OldVal OupdTime SecDesc
When a secret changes, the values of each of these keys must be looked up and replicated by Netlogon as part of the normal domain accounts database replication process.
The 5714/5716 event pair is generated when one or more of these values is missing.
During a change to an LSA secret, there is an intermediate state where these five subkeys have been deleted and a temporary key, PolMod, is present. If the transaction is not completed atomically, this key could persist, resulting in a corrupted and non-replicatable LSA secret.