When you are moving a connector to a new server you want to first make sure you have removed the old connector from SOI before installing the new one. You can remove the connector by logging into the SOI UI and selecting the Administration tab then Connector Configuration. Select the connector then choose the 'Remove' button.
All the old Alerts, Services, and CI's imported need to be cleaned up from the SOI database and a connector remove does this. Once the remove completes you can install the connector on the new server.