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Applies to: 
SQL Server
Details
| Attribute | Value |
|---|---|
| Product Name | SQL Server |
| Event ID | 9790 |
| Event Source | MSSQLSERVER |
| Component | SQLEngine |
| Symbolic Name | SB3_XMIT_ERROR_ENTRANCE_BROKER_SINGLE_USER |
| Message Text | Unable to route the incoming message. The system database MSDB containing routing information is in SINGLE USER mode. |
Explanation
An error occurred while trying to classify a message received off the wire because the MSDB database was in Single User mode.
User Action
Change MSDB to be in MULTI USER mode with the ALTER DATABASE command.