| Event Id | 1010 |
| Source | IAS |
| Description | There was an authentication failure because of an unknown user name or a bad password. |
| Event Information | Cause: This error has several reasons: 1. The user has typed in the wrong username or password. 2. Realm replacement might be set up incorrectly, or in the wrong order, so that the domain controller cannot recognize the user name. 3. If the remote access server is a member of domain and the user response does not contain a domain name, then the domain name of the remote access server is used. 4. Some NASs automatically strip the domain name from the username before forwarding the username to a RADIUS server. 5. The user might be using CHAP, but Active Directory might not be configured to store reversibly-encrypted passwords. Resolution: Following are the resolutions for corresponding reasons: 1. Check the user's Windows 2000 user name and account password to make sure they are typed correctly and that the account is valid for the domain IAS is authenticating the user against. 2. Adjust the realm replacement rules. 3. To use a different domain name than that of the IAS server, on the computer running IAS, set the following registry value to the name of the domain that you want to use: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\RasMan\PPP\ControlProtocols\BuiltIn\DefaultDomain 4. Turn off the feature that strips the domain name from the username. For more information, see your NAS documentation. 5. To use CHAP authentication with IAS, configure the dial-in profile for a user or group to use CHAP. The NAS and the user's dialing program (such as Connection Manager) should also be configured to use CHAP authentication. You also need to enable CHAP on the domain controller. After you enable reversibly-encrypted passwords in a domain, all users must change their passwords before they will be able to authenticate against the domain. |
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