Can't login when on a wired internet connection?

My desktop PC lacks a WiFi card, so I need to connect to the Internet with an Ethernet cable. It works pretty well for browsing the web and using Discord, but for some reason I can’t login to Windows Live Messenger. Whenever I try, it just says “We were unable to sign you into Windows Live Messenger at this time.” with the error code 80072ee2. I’m using the recommended version of WLM, and my operating system is the latest version of Windows 7 Ultimate.