| Event Id | 73 |
| Source | WLBS |
| Description | NLB Cluster %2 %1: Cluster IGMP multicast IP address %3 is invalid. Please check the NLB configuration and make sure that the cluster IGMP multicast IP address consists of four decimal byte values separated by dots. %4 |
| Event Information | According to Microsoft:The Internet Group Management Protocol (IGMP) multicast IP address in the registry is not valid. User Action: 1. Open the following registry key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\WLBS\Parameters\Interface\{GUID} where the GUID is the globally unique identifier of the network adapter that is experiencing the problem. This is the network adapter that is bound to Network Load Balancing (NLB). If NLB is, or has been, bound to multiple network adapters, you can find the correct adapter by looking at the value for the ClusterIPAddress key for each GUID. 2. Examine the IPtoMcastIP key and verify that it is a non-zero value. If it is a value of zero, change it to a value of one. 3. In Network Connections, open NLB Properties (do not use NLB Manager). 4. Click OK. This action forces NLB to recalculate the IGMP multicast address automatically and subsequently reload the NLB driver. |
| Reference Links | Multihomed master browser may cause Event ID 8021 and 8032 |
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