Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
Unable to route the incoming message. The system database MSDB containing routing information is in SINGLE USER mode.
An error occurred while trying to classify a message received off the wire because the MSDB database was in Single User mode.
Change MSDB to be in MULTI USER mode with the ALTER DATABASE command.