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VMware VI Client
Port 901 is primarily used by the VMware Virtual Infrastructure (VI) Client, which facilitates management communication between VMware ESX/ESXi servers and the management interface. It often serves the connection flow from servers being managed back to the console, enabling user access to virtualization controls and management features..
VMware Virtual Infrastructure Client, also known as vSphere Client in later iterations, connects administrators to VMware vCenter Server or directly to ESX/ESXi hypervisors, allowing centralized management and configuration.
Port 901 is commonly associated with VMware’s proprietary Remote Console functionality and can be used for server-initiated communication, such as event or status updates to the client console. While TCP 902 is widely known for VM console traffic, port 901 may facilitate additional management features.
This port ties into the ecosystem of VMware’s virtualization solutions, where networked management traffic must remain isolated and controlled to maintain separation between guest, host, and administrative domains. It generally operates over unencrypted channels by default, increasing the importance of network segmentation.