Adding user to mongodb admin DB makes it impossible for me to use HTTP admin interface?

Do you have any firewall settings or the port is available to the world (if it's an actual domain).

I resolved the issue by going back and more carefully reviewing the security and authentication documentation. Specifically, I stopped all servers in the replica set, turned off security, removed all users from the admin database (it's a new install), and started the replica set. Then I added the user, restarted the replica set with security enabled (--keyfile), hit the admin interface at :28017, and when prompted for auth, used that newly-created admin credential successfully.

Just needed to be careful.

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