HealthCare.gov was inaccessible for several hours early Monday, the same day that enrollment ends for those wanting to buy health insurance plans covered by the Affordable Care Act. The site was closed between 3 a.m. ET and 8:30 a.m. due to an overnight maintenance session deployed to fix a bug, according to Business Insider.

Visitors who tried accessing the website during the wee hours were greeted with a "system is not available" banner and told to leave their email address for updates. A spokesperson said its regular maintenance window was longer than normal in preparation for today's demand. The website appears to now be fully operational.