Maintenance for the week of February 2:
• PC/Mac: No maintenance – February 2
• ESO Store and Account System for maintenance – February 3, 6:00AM EDT (11:00 UTC) - 4:00PM EDT (21:00 UTC)
As mentioned above, error 307 indicates you've been disconnected from the server, which can sometimes be for inactivity. When this happens, you should wait for a period of 15-20 minutes before attempting to login again. You are welcome to send in feedback on this error with a ticket here.