Event ID 20179 — RRAS Routing Interfaces

Applies To: Windows Server 2008

The server running Routing and Remote Access uses a routing interface to forward unicast IP and multicast IP packets. There are two types of routing interfaces: LAN interfaces and demand-dial interfaces. A LAN interface is a physical interface that typically represents a local area connection that uses local area networking technology such as Ethernet or token ring. A demand-dial interface is a logical interface that represents a point-to-point connection. The point-to-point connection is based on either a physical connection, such as two routers connected over an analog phone line that uses modems, or a logical connection, such as two routers connected over a virtual private network (VPN) connection that uses the Internet.

Event Details

Product: Windows Operating System
ID: 20179
Source: RemoteAccess
Version: 6.0
Message: Interface: %1 is unreachable because there are no modems (or other connecting devices) available for use by this interface.


Check the availability and response of the modem or other connection device

Possible resolutions include:

  • If the modem was disconnected or turned off, reconnect or turn on your modem, and then either restart the operating system or use Device Manager to scan for new hardware.
  • If the communications port is already in use by another connection, end the connection or change the connection to use a different port.


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 Routing Interfaces

Routing and Remote Access Service Infrastructure