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David Wallace 5David Wallace 5 

Logging into Developer page from a trailhead challenge.

I am attempting to get into the developers page and I can sign into my account. It seems I can't sign into the account from the challenges in Trailhead, it states "400 Bad Request" and also has "Request Header Or Cookie Too Large". I need access ASAP since my bootcamp starts in less than a week.
Naval Sharma4Naval Sharma4
Hi David,

Please clear all the cache and cookies of your browser. you will be able to login after restarting the browser.

David Wallace 5David Wallace 5
Not sure what happened but now I can't log into trailhead at all. It keep wanting me to go to the developer page and won't log me in at all. Dave
David Wallace 5David Wallace 5
It is still not letting me in, it allows me to log in and then says "Warning: Could not log you into the site. Redirecting you to log out." Please note this is critical and please feel free to call me at 415-297-5411. Dave David C. Wallace Enterprise Sales - Service Cloud Salesforce (M) 415.297.5411
DeepthiDeepthi (Salesforce Developers) 
Hi David,

Kindly reach the trailhead support (i.e., )so that the team can assist you on your issue.

Best Regards,
Quentin HQuentin H
Thank you Naval, Coockies cleanup made the job!
Apparently, I get that error when having 2 tabs connected to same Developer Edition in 2 separated instances of Chrome, I guess they both try to update some cookie concurrently and corrupt it in the way...