Maintenance for the week of December 23:
• NA megaservers for maintenance – December 23, 4:00AM EST (9:00 UTC) - 9:00AM EST (14:00 UTC)
• EU megaservers for maintenance – December 23, 9:00 UTC (4:00AM EST) - 14:00 UTC (9:00AM EST)
FYI, The Missing Guardian quest in lower Craglorn is broken.
I've submitted a ticket a couple days back and they returned to me saying they are aware of the issue and some day they will fix. So don't get your hope to high.