Turn OFF Printer and File Sharing

For Homegroups on Windows, Printer and File Sharing is turned ON by default. If you are at a public place, you should disable the Printer and File Sharing. This you can do by selecting Public Network when you are prompted to add the Wi Fi hotspot to your list of wireless networks. If you did not get that dialog box asking you to confirm whether you wish to place the new network into Home or Public group, you can manually check and disable File and Printer sharing.