The reliable message function of cluster resource services keeps track of each node in a cluster and ensures that all nodes have consistent information about the state of cluster resources.
Reliable messaging uses retry and timeout values that are unique to clustering. These values are preset to values that should suit most environments. However, they can be changed through the Change cluster resource services settings interface. The message retry and timeout values are used to determine how many times a message is sent to a node before a failure or partition situation is signaled. For a local area network (LAN), the amount of time it takes to go through the number of retries before a failure or partition condition is signaled is approximately 45 seconds using the default retry and timeout values. For a remote network, more time is allowed to determine whether a failure or partition condition exists. You can figure approximately 4 minutes and 15 seconds for a remote network.