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I'm also facing same problem with coinbase.Could not attempt to log in.It's seems doubt is they're really troubled with any issue?For me it's very urgent to solve this problem as soon as possible,hope they might be done.
Try it again. I was also unable to access them earlier.
But fortunately, they have already resolved this issue about 2 - 3 hours ago.
Update - The Coinbase website, Coinbase API, and GDAX website are now fully operational. We will continue to monitor site stability. Thank you for your patience.
Jan 5, 21:13 PST
https://status.coinbase.com <- : I saw this link on another thread and it's a great page to check first when you're having issues. They gave updates there almost hourly for this recent issue.