PUMPKIN ECLIPSE — An unknown threat actor with equally unknown motives forces ISP to replace routers. Getty Images One day last October, subscribers to an ISP known as Windstream began flooding message boards with reports their routers had suddenly stopped working and remained unresponsive to reboots and all other attempts to revive them. “The routers now just sit there with a steady red light on the front,” one user wrote, referring to the ActionTec T3200 router models Windstream provided to...