The easiest thing to do would be to actually install a Storage Manager agent on a server that can see both your production and iscsi storage network, and remove the virtual NIC you added. The agents can be downloaded here
If you must fix the current setup, you can try the following
- click on the spanner icon for the SM server resource in the web console and change the Storage Manager server IP address in the Communication section.
- browse to the install directory in Windows explorer, edit the core.xml file under the agent folder and change the IP address in both locations and restart the SolarWinds Storage Manager Collector service.