3/1/2023 0 Comments Ip scanner toolSlow network speeds or slow machines can also lead to ports incorrectly being classified as closed. By blocking popular ports at the ISP level, they provide a level of security for customers. Some Internet service providers intentionally block popular ports, like 21 or 80, on residential connections to deter customers from hosting their own FTP servers and websites. You can also double-check with another port scanner online, like the Nmap port scanner. You should always double-check your router configuration to be sure. However, just because a port displays as closed through our tool doesn't mean that it is closed. Otherwise, the port should be closed to remote communication. If a port is displayed as open, that means it is open for remote communication.
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