El respaldo de SQL de NetWorker falla: no se puede iniciar sesión en la instancia predeterminada de SQL Server

El respaldo de SQL de NetWorker falla con este error:
 

Cannot login to SQL Server Default Instance.

Ejemplos de errores en SQL Server son:
 

nsrnmsqlra NSR critical Cannot login to SQL Server <SQLName>
nsrnmsqlra NSR critical Microsoft SQL server documentation provides details about the following SQL Server Provider error:
nsrnmsqlra NSR critical Shared Memory Provider: No process is on the other end of the pipe.

nsrsqlsv NSR critical Cannot login to SQL Server Default Instance.
nsrsqlsv: Shared Memory Provider: No process is on the other end of the pipe.
nsrsqlsv: (Error: 233)

Consulte el siguiente enlace de Microsoft.

https://learn.microsoft.com/en-us/sql/tools/configuration-manager/creating-a-valid-connection-string-using-shared-memory-protocol?view=sql-server-ver16
 

Connections to SQL Server from a client running on the same computer use the shared memory and named pipes protocols. 
Shared memory has no configurable properties. Shared memory is always tried first, and can't be moved from the top 
position of the Enabled Protocols list in the Client Protocols Properties list. The Shared Memory protocol can be 
disabled, which is useful when troubleshooting one of the other protocols.

Conclusiones

Es necesario habilitar la memoria compartida en SQL Server para que NMM funcione correctamente.