Admin Router hands over login requests to the IAM. Confirm that the request is received by Admin Router on any of the master nodes first using the following command.
sudo journalctl -u dcos-adminrouter.service
Identity and Access Manager
The IAM is the only entity emitting DC/OS authentication tokens. To debug login problems, check the IAM (Bouncer) on the masters using the following command.
sudo journalctl -u dcos-bouncer.service