Event ID 20157 — RRAS Multicast Scope Configuration

Applies To: Windows Server 2008

A multicast scope is a named range of IP multicast addresses that is expressed with an IP address and mask. After multicast scopes are configured, you can use them to create scope-based multicast boundaries in the properties of an IP routing interface.

Routing and Remote Access can forward multicast traffic in limited network configurations. The primary use of Routing and Remote Access as a multicast router is to connect a subnet to a multicast-enabled intranet that contains routers running multicast routing protocols. To fully support efficient multicast forwarding on a multiple-router intranet, you must install multicast routers that run one or more multicast routing protocols.

Event Details

Product: Windows Operating System
ID: 20157
Source: RemoteAccess
Version: 6.0
Message: The interface: %1 could not be enabled for multicast. %2 will not be activated over this interface.


Enable the interface or configure multicast scopes

Confirm that the network interface routing multicast traffic is enabled and a multicast scope is configured.

To perform these procedures, you must have membership in Administrators, or you must have been delegated the appropriate authority.

Follow the procedures in the order in which they appear until the problem is resolved.

Enable the network interface

To enable the network interface:

  1. Open Network Connections and check the status of the network device.
  2. Right-click the network device, and then click Enable.

Configure multicast scopes

To configure multicast scopes:

A scope is a range of IP multicast addresses and is defined by specifying the address range as an IP address and mask. Multicast addresses in the range of to ( are used to specify administrative scopes, as defined in RFC 2365. However, the range of is defined as a local scope and cannot be divided further.

  1. Open Routing and Remote Access. Click Start, click Run, type rrasmgmt.msc, and then press ENTER.
  2. In the console tree, double-click the server name.
  3. Double-click IPv4, right-click General, and then click Properties.
  4. On the Multicast Scopes tab, click a multicast scope, and then click Edit.
  5. Review the settings, and then add or delete the scope, as appropriate.


To verify that multicast traffic is being forwarded to the multicast group address, on a receiving host, open a multicast-enabled application and verify streaming content is being received.

RRAS Multicast Scope Configuration

Routing and Remote Access Service Infrastructure