| Event Id | 401 |
| Source | SNA Server |
| Description | Single Sign-On request for Domain\User failed - failed to communicate with the host account cache for host domain Host Security Domain |
| Event Information | "According to Microsoft: CAUSE: The Host Account Cache database uses a log shipping mechanism for database synchronization. When the master Host Account Cache database is updated, the log shipping mechanism sends a message to the backup Host Account Cache databases. The message indicates that an update is available. The backup Host Account Cache databases connect to the master Host Account Cache database to copy the latest transaction log that contains the updates. After the backup Host Account Cache database successfully copies the transaction log, the transaction log is imported to update the local database. While the transaction log is being imported, the backup Host Account Cache database cannot perform SSO account lookups. If a backup Host Account Cache database receives an SSO account lookup request while the transaction log update is being performed, an error message is returned to the application that is requesting the SSO account lookup, and the account lookup is not successful. RESOLUTION: A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article. Only apply it to systems that are experiencing this specific problem. MORE INFORMATION: 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. The Host Account Cache database has been updated to support SSO account lookup retries when errors occur during the first SSO account lookup request. To enable SSO retries, apply the update, and then add the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SnaDatabase\Parameters registry entry. Follow these steps, and then quit Registry Editor: 1. Click Start, click Run, type regedit, and then click OK. 2. Locate and then click the f |
| Reference Links | Single Sign-On Is Not Successful While the Backup HAC Is Updating the Local Database |
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