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TCP/IP: Port

Checking if a port is open

Checking if a port is open is useful to find to if port forwarding is setup correctly or if server applications are being blocked by a firewall.
In the shell, it's possible to check if a port is open with: 
$ nc -vz localhost 1521
In the internet, a web-frontend to check for open ports is open port checker.
Another web tool is here.

See also

TCP/IP

Index

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