Here is a thread from yesterday about the same thing.
https://forums.elderscrollsonline.com/en/discussion/445920/login-issues-error-108-error-200-no-valid-internet-connection#latest
Many were unable to log in or even use the website. I was finally able to log in yesterday later in the evening, and it was mentioned in gchat that ZoS is using 3rd party for traffic to help with ddos attacks, but I cannot confirm that info.