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In a Nutanix environment, Synchronous replication (including Metro Availability and Synchronous Protection Policies) relies on a specialized service known as Anduril to manage the real-time mirroring and state transitions of virtual machines. While standard asynchronous replication primarily uses ports 2009 (Stargate) for data transfer and 2020 (Cerebro) for metadata and replication management, synchronous replication introduces additional requirements for low-latency communication between the Anduril services on the source and destination clusters.

The error message " Failed to connect to remote Anduril " specifically indicates that the local cluster ' s management plane is unable to communicate with the remote cluster ' s synchronous replication manager. TCP port 2036 is the dedicated port for cross-cluster communication between Anduril services. This port is used to negotiate the " stretch " of the VM across sites, coordinate the initial sync, and maintain the health heartbeat required for high-availability failover decisions. If port 2036 is blocked by a physical or virtual firewall between the clusters, the " VmSyncRepEnable " request will time out or fail, preventing the VM from ever entering the " Sync " (Active-Active) state. Troubleshooting synchronous replication always begins with verifying that the 5ms latency requirement is met and that port 2036 is open alongside the standard ports 2009 and 2020 to ensure both data and control traffic can flow without interruption between availability zones.

The " Test Failover " feature in Nutanix Disaster Recovery is a critical tool for ensuring that a BCDR plan is actually functional before a real disaster occurs. The primary goal of a test failover is to validate the entire recovery orchestration—including power-on sequences, script execution, and network mappings—in a completely non-disruptive manner.

During a test failover, the virtual machines are recovered at the destination site using the most recent snapshots, but they are typically connected to an " Isolated " or " Test " network. This allows the administrator to log into the recovered VMs and verify that the application starts correctly without causing any IP address conflicts or interference with the live production systems at the primary site. Unlike a " Planned Failover " or " Unplanned Failover, " a test failover does not move the production workload (negating Option B) and does not stop ongoing replication (negating Option D). It is purely a validation task designed to identify gaps in the Recovery Plan, such as missing dependencies or incorrect network assignments, thereby providing confidence that the organization ' s RTO and RPO goals can be met during a real emergency.