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You may want to look at installing it again. Are you using all of options available and installing all of the keystone endpoints? This used to happen in Havana when there were more than 8 endpoints. The token size was too large and it would "login" but would end up failing. I fixed this before by setting up the Dashboard to use a DB backend instead of MemCached. If you are using Devstack + Icehouse then you should be able to modify the .conf files for the services you installed and add :

max_header_line = 16384

You could look over bug reports for devstack and see if it has been reported. I wasn't able to track down actual errors when this occurred, just the symptoms.