If a user name is used by an unauthorized person or is stolen, a common technique to gain access is called "brute force attack". This is a method of systematically trying different passwords until the correct password is found.
The Advantage Database Server keeps track of how many times a user has entered a wrong password. By default, the maximum allowed failed password attempts is 5. This seems to be a reasonable number given the fact that the brute force method would fail hundreds of times before having a chance at being successful, but an authorized user would most likely never reach 5 failed attempts. If a user does reach the maximum failed attempts, their Internet access will be disabled until the administrator re-enables the access.
See Enabling Internet Access in the Data Dictionary for more information.
By default Advantage Database Server will only enforce the maximum failed login attempts for Internet Connections. If you wish to enforce the limit for all remote server connections, you can enable the "Enforce Max Failed Logins" property on the data dictionary. This will cause Advantage Database Server to count all failed login attempts (from internet or remote server connections) and disable the login of any user that exceeds the maximum. See AdsDDSetDatabaseProperty or sp_ModifyDatabase on how to enable or disable this enforcement property. Once a user has their login disabled, a database administrator may re-enable them by setting their "Logins Disabled" property to FALSE by using the AdsDDSetUserPropery API or the sp_ModifyUserProperty system procedure.