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Cannot authenticate, invalid user/passwort/secret

Problem

If you see the error message Cannot authenticate, invalid user/passwort/secret when trying to register the agent controller, you can check a couple of things.

Possible solutions

1. It is obvious, but it needs to be said: Check whether the username and the password or the secret are correct.
2. This error message can also be displayed when the option disable the login to this account is activated for this user. So please go to Setup > Users > Users in Checkmk and check if you see the following icon in the row for the user you are trying to authenticate with: 
   In this case you have to edit the user and deactivate the checkbox in front of disable the login to this account.

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