The officials are requesting that Healthcare.gov users reset their passwords after a continuing internal review by the Department of Homeland security flagged the site as possibly being vulnerable to a Heartbleed exploit. The move to reset passwords is being taken out of an abundance of caution, according to a a notice published on the site, which serves as a portal for the health insurance exchanges set up under Obamacare. Those site issues have since been fixed, and the Obama administration recently announced that 8 million Americans have signed up for health insurance through the exchanges.