Q. I have a secular Jewish tenant who uses my WiFi. Should I be turning it off on Yomtov and Shabbos?
A. Providing your WiFi is not any different than using the electricity you supply to your tenant. It is the tenants responsibility to use it only in the permitted way during Shabbos and Yom Tov.
Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit'a