Internet UDP port 4443 is commonly used by applications that require secure data transmission, such as Virtual Private Networks (VPNs). For example, Phobos Ransomware, a type of malware, uses this port to communicate with its command and control servers. Additionally, Simple Secure Internet Live Conferencing (SILC) protocol also uses this port for encrypted, peer-to-peer professional conferencing. However, it's important to note that the usage of this port can vary depending on the specific software or system configuration.
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