Port blocking

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An internet port is an additional piece of information that helps identify a process or service. For example, web browsing is associated with port number 80. The Internet Assigned Numbers Authority maintains the Service Name and Transport Protocol Port Number Registry and defines legitimate service names and port numbers.

To protect the privacy and security of its network and its customers, Charter Communications blocks internet ports that are vulnerable to exploitation by malicious software. Below is a list of ports that Charter blocks and why.