Default username and password to the main IP Fabric user interface is admin/netHero!123.
For an unknown reason, it might happen that on the first start-up default system username and password is not working. To fix this issue, please login to the System administration on an address https://ipfabric.example.com:8443 and after login as osadmin user go to Create admin and there create a new local administrator account.
With this new account, you can login to the main IP Fabric user interface and change a password to the default admin account or delete him. This can be done in Setting → User Management menu. Also, other user accounts can be created here.