You can reset the password via the Console:
- Console/Serial into the Controller
- Login using username as "password" and password as "forgetme!"
- Enter the enable password as "enable"
- Move to config mode and use the command "mgmt-user admin root"
- Type the new password for admin account
- Logout
- Log back in with the new password.
- write mem
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As far as the "server certificate" message goes it would be helpful if you can post a screen capture showing the message and how the client is connecting when receiving the error. Also, once you have logged into the controller let us know the version of SW running using the CLI command "show image version".
The default certificate on the controller recently expired but has been updated in later releases of SW. I am attaching a copy of the Support Bulleting explaining the issue. Not sure if this is what you are seeing though.....