Event ID 50007 — RRAS MGM Initialization

Applies To: Windows Server 2008 R2

The Multicast Group Manager (MGM) application programming interface (API) enables developers to write multicast routing protocols that interoperate with routers running the Multicast Group Manager. When more than one multicast routing protocol is enabled on a router, the MGM coordinates operations between all routing protocols. The MGM informs each routing protocol when group membership changes occur, and when multicast data from a new source or destined to a new group is received.

After MGM is initialized on the interface, group membership changes can be comunicated.


Event Details

Product: Windows Operating System
ID: 50007
Source: Microsoft-Windows-RasServer
Version: 6.1
Message: IPMGM was unable to create a semaphore. The data is the error code.


Reconfigure Multicast Group Manager, reinstall IGMP, check memory status, or restart Routing and Remote Access service

Possible resolutions:

  • Reconfigure IPMGM to allocate memory from its heap and create a semaphore. Register IPMGM with Routing Table Manager (RTM).
  • Remove and reinstall the IGMP protocol. For more information, see the "Remove and reinstall IGMP" section.
  • Check for any instance of memory leaks, failure to pass data, or failure in establishing a session. Restarting the system might resolve these issues.
  • This computer might be low on memory. For more information, see the "Check memory usage on the server" section.
  • Stop and restart the Routing and Remote Access service. For more information, see the "Restart the remote access service" section.
  • Restart the computer.
  • Reinstall the Windows operating system.

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

Remove and reinstall IGMP

To remove and reinstall IGMP:

  1. Open Routing and Remote Access. Click Start, click Run, type rrasmgmt.msc, and then press ENTER.
  2. In the console tree, expand IPv4, right-click IGMP,** **and then click Delete.
  3. Click Yes in the confirmation dialog box.
  4. Under IPv4, right-click General, and then click New Routing Protocol.
  5. Click IGMP Router and Proxy, and then click OK.
  6. Under IPv4, right-click IGMP, and then click New Interface.
  7. Click the interface for IGMP, and then click OK.
  8. Modify the settings in the IGMP properties dialog box, and then click OK.

Check memory usage on the server

To check memory usage on the remote access server:

  1. On the remote access server, click Start, click Run, type taskmgr, and then click OK.
  2. In the Windows Task Manager dialog box, click the Performance tab.
  3. Under Physical Memory, check the remote access server's memory usage.
  4. If necessary, free up available memory by ending non-essential applications or processes.

Restart the remote access service

To restart the remote access service:

  1. Open Routing and Remote Access. Click Start, click Run, type rrasmgmt.msc, and then press ENTER.
  2. By default, the local computer is listed as a server. To add another server, in the console tree, right-click Server Status, and then click Add Server. In the Add Server dialog box, click the appropriate option, and then click OK.
  3. In the console tree, right-click the server you want to restart, click All Tasks, and then click Restart.


You can verify multicast routing configuration with the mrinfo command. You can use the configuration information to aid in the troubleshooting of multicast forwarding and routing problems.

The mrinfo command queries a specified multicast router with an Internet Group Management Protocol (IGMP) message. The response to the query contains a version number, the list of interfaces and the neighbors on each interface, metrics, Time to Live (TTL) thresholds, and flags. The syntax of the mrinfo command is:

mrinfo [-n] [ -i address ] [ -r retry_count ] [ -t timeout_count ] multicast_router

  • The -n option displays IP addresses in numeric format.
  • The -i option specifies the IP address of the interface from which you want to send the mrinfo query. By default, the interface from which to send the mrinfo query is determined by the IP routing table.
  • The -r option specifies the neighbor query retry limit. The default value is 3.
  • The -t option specifies how long, in seconds, mrinfo waits for a neighbor query reply. The default value is 4.

The following is an example of the mrinfo command:

C:\>mrinfo [version 18.55,mtrace,snmp]: -> (local) [1/0/querier/leaf] -> (test2.microsoft.com) [1/0] -> (test3.microsoft.com) [1/0] -> (local) [1/0/querier/leaf]

In the preceding example, mrinfo is run against the multicast router at The first line shows the multicast router configuration: version number (for servers running Routing and Remote Access, the version number reflects the build number of the operating system) and flags (mtrace and snmp supported).

Each additional line displays the interfaces on the multicast router and the neighbors on each interface. Interfaces and have no neighbors. Interface has two neighbors, and For each line, mrinfo displays the interface and neighbor, the domain name for the neighbor, the multicast routing metric, the TTL threshold, and flags indicating its role on the network, such as the IGMP querier of the network (querier) or whether it has no neighbors (leaf).

RRAS MGM Initialization

Routing and Remote Access Service Infrastructure