LinkedIn's domain name was temporarily redirected to a third-party server Thursday, which resulted in a service outage and potentially put user accounts at risk of compromise. Uptime monitoring service Pingdom recorded that LinkedIn was unavailable between 2:21 a.m. and 6:16 a.m. U.K. time. Some users trying to access the website saw a domain parking page offering the domain for sale, according to user reports on Hacker News.