Cisco Secure Access Control Server (ACS) appliances lose access to the Graphical User Interface (GUI) and the Command Line Interface (CLI) if the administrator name is same as the hostname.
These are the results when the CLI is used to set an administrator account for the Cisco Secure ACS appliance when the administrator name is the same as the ACS appliance name:
As a workaround, ensure that the administrator name is different from the hostname.
If this problem occurs, the ACS appliance needs to be re-imaged.
For more information, refer to Cisco bug ID CSCeh17104.
For more information on configuring Cisco Secure ACS, refer Installing and Configuring Cisco Secure ACS Solution Engine