A cluster computer system capable of filtering stale messages resulting from changes in a cluster membership. The system has interconnected nodes each hosting one or more applications and having a node filter for filtering messages to and from other nodes based on a membership identification and information about source nodes and destination nodes of the messages. Each application of a hosting node includes multiple application filters corresponding to other nodes in the system for filtering messages to and from the application based on the membership identification and an application view of the cluster membership. Each node further includes a communication agent for detecting when another node is disconnected from the membership and for updating its filters with the membership identification that reflects the node disconnection.