The Internet TCP port 20000 is commonly used by the DNP (Distributed Network Protocol), which is a set of communications protocols used between components in process automation systems. Its main use is in utilities such as electric and water companies. An example of software that uses this port is the DNP3 protocol, an open and optimized protocol that allows reliable communications between many types of data acquisition and control equipment. It is also used by the UserGate Proxy & Firewall for its real-time monitor service.
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