The highlighted credential is all that matters for getting the list of CIFS shares itself.
The Storage Manager agent is also referred to as Storage Manager proxy agent is some places in the documentation. The agents can be downloaded from below
http://knowledgebase.solarwinds.com/kb/questions/4944/Storage+Manager+Agent+Download+Links
The Storage Manager Collector service also acts as an agent on the Storage Manager server
In any case, if you click on the icon with the little green play button, you can bring up the agent status page. You can further click on the netApp module to see it's log. See if there are any error logs in there