nomachine error 138 server on another subnet

The resource DLL implements online and offline operations and health monitoring for custom resources. Cluster aware applications like SQL Server provide custom interfaces to the resource monitor via resource DLLs. The resource host performs operations on cluster resources when called upon by the cluster service. The resource host operates as a separate process and is the interface between the cluster service and cluster resources. Cluster node and resource detectionĮach node in the cluster runs a single cluster service, which operates the failover cluster and monitors all cluster resources.

With many failure cases and without fully dependable communication between services, the AG depends on various failover detection mechanisms to detect and respond to failures independently of each other so the cluster state is always consistent for all nodes. Furthermore, the availability group (AG) needs to be able to withstand system wide events like network and disk failures, which may prevent communication or interrupt functionality. In most scenarios, these services successfully communicate, however this communication is not perfectly reliable even between services on the same machine. The cluster service, the resource host, and the SQL Server instance synchronize with each other via RPC, shared memory, and T-SQL. The cluster service could detect quorum loss, the resource DLL could detect an issue surfaced by Always On health detection, or manual failover may be initiated directly on the primary instance. Multiple services on each node work to detect failures. Others require more tolerance for transient network issues and waits from high resource usage and are okay with slower failovers. Certain applications and workloads require more aggressive monitoring to limit downtime following hard failures. Differences in hardware, software, and cluster configurations as well as different application requirements for uptime and performance require specific configuration for lease, cluster, and health check timeout values.

Nomachine error 138 server on another subnet