MSSQL Catalyst Plugin can't Connect to SQL-Server

[erp-factory]

HI,

When trying to backup an MSSQL-Server database using the extended stored Procedure/dll deliverd with the Catalyst Plugin I ma getting the following Error:

ERROR: Failed to connect to SQL Server .: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) Error : -1

I am running this command:
exec xp_StoreOnce 'BACKUP DATABASE [master] TO STORE=''<IP/Store_name>''
 WITH CHECKSUM,
 MAXTRANSFERSIZE = 4194304, 
 $Instance=<MYINSTANCE>'

When starting the Backup via the Plugin itself it works fine:
HPStoreOnceForMSSQL.exe  -backup "BACKUP Database [master] TO STORE='<IP/Store_name>' 
 WITH MAXTRANSFERSIZE=4194304,
 CHECKSUM,STATS=10" 
 -instance <MYINSTANCE>

I have also tried to use different quotationmarks with $Instance without success.

Has anybody been able to back up a database from a named instance using the Plugin and the extended stored procedure so far?

Regards.