Maintenance for the week of December 1:
• PC/Mac: No maintenance – December 1
• NA megaservers for patch maintenance – December 3, 3:00AM EST (8:00 UTC) - 12:00PM EST (17:00 UTC)
• EU megaservers for patch maintenance – December 3, 8:00 UTC (3:00AM EST) - 17:00 UTC (12:00PM EST)
You could be running into a connection issue preventing you from logging into ESO. If you continue to receive the message "Unable to connect to game server" when logging in you can go through the troubleshooting steps in the help article linked below.