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Event ID 20187 — RRAS Authentication and Accounting

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Applies To: Windows Server 2008 R2

If a remote access server is configured for Windows authentication, the security features of Windows Server 2008 are used to verify the credentials for authentication, and the dial-in properties of the user account are used to authorize the connection.

If the remote access server is configured for RADIUS authentication, the connection request, including credentials, is forwarded to the RADIUS server for authentication and authorization. If the RADIUS server is a computer running Network Policy Server (NPS), NPS performs authentication against the credentials that are stored in the user account database, such as Active Directory Domain Services (AD DS) or the local Security Accounts Manager (SAM) database on the server running NPS. NPS performs authorization using the dial-in properties of the user account and with network policies that are configured in NPS.

Event Details

Product: Windows Operating System
ID: 20187
Source: RemoteAccess
Version: 6.1
Symbolic Name: ROUTERLOG_NTAUTH_FAILURE
Message: The user: %1 failed an authentication attempt due to the following reason: %2

Resolve

Review the remote access service error code

There is not enough information available in the Routing and Remote Access service event message to provide a recommendation for the resolution of the problem. If you continue to get this error, contact Microsoft Product Support Services. For more information, see https://go.microsoft.com/fwlink/?LinkId=52267.

For more information about remote access service error codes, see article 163111 in the Microsoft Knowledge Base (https://go.microsoft.com/fwlink/?LinkID=91455).

Verify

To verify that the remote access server can accept connections, establish a remote access connection from a client computer.

To create a VPN connection:

  1. Click Start, and then click Control Panel.
  2. Click Network and Internet, click Network and Sharing Center, and then click Set up a connection or network.
  3. Click Connect to a workplace, and then click Next.
  4. Complete the steps in the Connect to a Workplace wizard.

To connect to a remote access server:

  1. In Network and Sharing Center, click Manage network connections.
  2. Double-click the VPN connection, and then click Connect.
  3. Verify that the connection was established successfully.

RRAS Authentication and Accounting

Routing and Remote Access Service Infrastructure