The Qlik SAP Extractor Connector connects to the SAP system in a different way than the other connectors. It needs the Qlik SAP Network Server service to handle the job requests and receiving data from SAP. The benefits of the Extractor connector is that it handles jobs with many millions of rows of data. This is the recommended connector for large data amounts.
The "Host" and "Port" targets the location of the running service, it can be on your own PC or a dedicated server. If it is located on you own PC the Host would be "localhost" (or 127.0.0.1) and the Port is by default 8680.
More information on the Qlik SAP Network Server service can be found here: