Internet TCP port 5900 is primarily used by Virtual Network Computing (VNC) systems for remote desktop control. Examples of software that utilize this port include RealVNC, TightVNC, and UltraVNC. These applications allow a user to view and interact with one computer (the "server") using a simple program (the "viewer") on another computer anywhere on the Internet. The server passively listens for connections from clients on TCP port 5900.
TCP port 5900 is commonly associated with the Virtual Network Computing (VNC) service, which provides remote control software. In the past, hackers have exploited this port to gain unauthorized access to systems. They typically do this by scanning the internet for systems that have port 5900 open and then attempting to use default or weak passwords to gain access. Once in, they can control the system as if they were sitting in front of it. This has led to various types of malicious activities, including data theft, system damage, and the deployment of further malware. Therefore, it's crucial to secure systems with strong, unique passwords and to consider additional security measures such as IP whitelisting or VPN use.
