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URL No Longer Exists
Keeps telling me "URL No Longer Exists" when trying to log in.
https://developer.salesforce.com/forums/trailhead/login_wizard/2?unit=dreamforce_overview%26state%3Did+api+web
https://developer.salesforce.com/forums/trailhead/login_wizard/2?unit=dreamforce_overview%26state%3Did+api+web
i'm having the same issue when trying to login to take Trailhead challenges
I'm also having this problem. Started about an hour ago for me.

I was having this issue and it resolved after I logged out of Trailhead and logged back in (still needed to authenticate with my developer account - but it worked at that point).
Fixed it right away. I feel silly for not trying that first. Thanks!
We're looking into this. Thanks for letting us know. In the meantime, please log out ang log back in as a workaround. Thanks for checking out Trailhead!