I suggest you read the relevant threads on this page about server problems today, together with the banner at the top of the forum and Gina's post which you can access in Dev Tracker. In short, there has been a major internet outage affecting large parts of the US and Europe.
As there are multiple threads on the current login issues we will be closing this thread.
We are currently investigating issues some players are having logging into the megaservers. It appears CenturyLink is experiencing an outage that is likely affecting connectivity. You can keep an eye on the status page here: https://status.ctl.io/