Remote Access Account Lockout is enabled, and the user’s authentication attempts have exceeded the designated lockout count because the credentials they supplied (user name and password) are not valid. When the lockout count for a user account is reset to 0 due to either a successful authentication or an automatic reset, the registry subkey for the user account is deleted. To manually reset a user account that has been locked out before the failed attempts counter is automatically reset, delete the following registry subkey that corresponds to the user’s account name: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RemoteAccess\Parameters\AccountLockout\domain name:user name
The Network Access Permission setting in the dial-in properties of the user account is set to Deny access to the user.
To change the Network Access Permission setting to either Allow access or Control access through NPS Network Policy. obtain the properties of the user account in the Active Directory Users and Computers Microsoft Management Console (MMC) snap-in, click the Dial-in tab, and then change Network Access Permission .
Authentication failed. Either the client computer attempted to use an authentication method that is not enabled on the matching network policy or the client computer attempted to authenticate as Guest, but guest authentication is not enabled. To resolve this issue, ensure that all client computers are configured to use one or more authentication methods that are allowed by matching network policies.
NPS denied the connection request because the value of the Calling-Station-ID attribute in the Access-Request message did not match the value of Verify Caller ID in user account dial-in properties in the Active Directory Users and Computers snap-in.
The user or computer does not have permission to access the network on this day at this time. To change the day and time when the user is permitted to connect to the network, change the Day and Time Restrictions in the constraints of the matching network policy. For more information, see Constraints Properties .
The telephone number of the network access server does not match the value of the Calling-Station-ID attribute that is configured in the constraints of the matching network policy. NPS denied the Access-Request message.
The network access method used by the access client to connect to the network does not match the value of the NAS-Port-Type attribute that is configured in the constraints of the matching network policy. NPS denied the Access-Request message.
The user password has expired or is about to expire and the user must change their password, however Authentication Methods in network policy constraints are not configured to allow the user to change their password.
To allow the user to change their password, open the properties of the matching network policy, click the Constraints tab, click Authentication Methods. and then in the details pane select the appropriate authentication method and User can change password after it has expired check box.
The purposes that are configured in the Application Policies extensions, also called Enhanced Key Usage (EKU) extensions. section of the user or computer certificate are not valid or are missing. The user or computer certificate must be configured with the Client Authentication purpose in Application Policies extensions. The object identifier for Client Authentication is 188.8.131.52.184.108.40.206.2.
To correct this problem, you must reconfigure the certificate template with the Client Authentication purpose in Application Policies extensions, revoke the old certificate, and enroll a new certificate that is configured correctly. For more information, see Foundation Network Companion Guide: Deploying Computer and User Certificates at http://go.microsoft.com/fwlink/?LinkId=113884.
NPS attempted to write accounting data to the data store (a log file on the local computer or a SQL Server database), but failed to do so for unknown reasons.
Authentication failed due to an Extensible Authentication Protocol (EAP) session timeout; the EAP session with the access client was incomplete.
The authentication request was not processed because it contained a Remote Authentication Dial-In User Service (RADIUS) message that was not appropriate for the secure authentication transaction.
The local NPS proxy server forwarded a connection request to a remote RADIUS server, and the remote server rejected the connection request. Check the event log on the remote RADIUS server to determine the reason that the connection request was rejected.
The local NPS proxy attempted to forward a connection request to a member of a remote RADIUS server group that does not exist. To resolve this issue, configure a valid remote RADIUS server group.
The local NPS proxy did not forward a RADIUS message because it is not an accounting request or a connection request.
The local NPS proxy server cannot forward the connection request to the remote RADIUS server because either the proxy cannot open a Windows socket over which to send the connection request, or the proxy server attempted to send the connection request but received Windows sockets errors that prevented successful completion of the send operation.
The remote RADIUS server did not respond to the local NPS proxy within an acceptable time period. Verify that the remote RADIUS server is available and functioning properly.
The local NPS proxy server received a RADIUS message that is malformed from a remote RADIUS server, and the message is unreadable. This issue can also be caused if a connection request contains more than the expected number of User-Name attributes, or if the User-Name attribute value is not valid, such as if the value has zero length or if it contains characters that are not valid.
The certificate provided by the user or computer as proof of their identity is a revoked certificate. Because of this, the user or computer was not authenticated, and NPS rejected the connection request.
Due to a missing dynamic link library (DLL) or exported function, NPS cannot access the certificate revocation list to verify whether the user or client computer certificate is valid or is revoked.