| Event Id | 73 |
| Source | Microsoft-Windows-NLB |
| Description | NLB cluster [%2]: The NLB cluster IGMP multicast IP address %3 is invalid. Please check the NLB configuration and make sure that the cluster IGMP multicast IP address is in a valid format. |
| Event Information | According to Microsoft: Resolution: Check that the cluster IGMP multicast address is valid.If the Network Load Balancing (NLB) cluster detects that the Internet Group Management Protocol (IGMP) multicast IP address is invalid, you should check the NLB configuration and make sure that the cluster IGMP multicast IP address is in a valid format.When you are using NLB Manager, you must be a member of the Administrators group on the host that you are configuring, or you must have been delegated the appropriate authority. If you are configuring a cluster or host by running NLB Manager from a computer that is not part of the cluster, you do not have to be a member of the Administrators group on that computer.To check the IGMP address: 1.Click Start, click Administrative Tools, and then click Network Load Balancing Manager. You can also open NLB Manager by typing Nlbmgr at a command prompt. 2. If NLB Manager does not already list the cluster, connect to the cluster. 3.Right-click the cluster, and then click Cluster Properties. 4.Ensure that the IGMP multicast check box is selected to enable IGMP support on all hosts in the cluster. When you enable IGMP support, the allowed multicast IP address is restricted to the standard class D range; that is, 224.0.0.0 to 239.255.255.255. |
| Reference Links | Event id 73 From Source Microsoft-Windows-NLB . |
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