Maintenance for the week of June 9:
• PC/Mac: No maintenance – June 9
• ESO Store and Account System for maintenance – June 11, 6:00AM EDT (10:00 UTC) - 4:00PM EDT (20:00 UTC)
Please see these two articles here and here for information on these errors. For Xbox in particular, I would recommend trying the steps in this article to see if they help with the connection to the server.