Passing connection string properties when using DTEXEC

I am wondering what the correct format is for passing connection string properties on the command line when using dtexec:

dtexec.exe /Ser IpAddress\Instance /IS "\SSISDB\Data Warehouse\MyProject\MyPackage.dtsx" /DumpOnError /Set \Package.Variables[DW_ConnectionString].Properties[Value];\""Data Source=IpAddress;Initial Catalog=DWDB;Provider=SQLNCLI10.1;IntegratedSecurity=SSPI;"\"

I have defined the above command line configuration where I am attempting to pass override properties for the default connection string properties. The packages I'm targeting are not using package connections, but instead project level parameters/properties have been defined to store the DB connections. For some reason I can't get this to work . I am getting an error message on the server saying

Failed to configure an overridden property that has the following path: \Package.Variables [DW_ConnectionString].Properties [Value]. An error occurred while setting the value of property "Value". The error returned is 0x80020009

Is my format correct for overriding properties? The packages are hosted on a remote server

Try using DTEXECUI next time to generate your command string. It has places for all of the variables, connection managers etc. All you have to do is bring up your package and it fills everything in. You then enter any changes you want in the GUI then go to the Command line tab and it will give you the string to put after DTEXEC.EXEC. You can of course also run the package from DTEXECUI also.