Test Port Lisen on Linux & Windows

README.md

General

If you want to test connection (port listen) to another server you can use netcat. On linux will be ncat command & on windows will be ncat command.

Linux

• Installation

apt install -y netcat

• Usage

#### for TCP
nc -vz localhost 80

#### for UDP
nc -vzu localhost 80

for Windows

• You can install package from download manually from https://nmap.org/dist/nmap-7.92-setup.exe
• Usage

#### for TCP
ncat -v -n localhost 80

#### for UDP
ncat -v -n -u localhost 80

Goals of Connected

C:\Users\Administrator>ncat -v -n -u 10.0.3.140 12530
Ncat: Version 7.92 ( https://nmap.org/ncat )
Ncat: Connected to 10.0.3.140:12530.

Goals of not Connected

C:\Users\Administrator>ncat -v -n 10.0.3.140 12530
Ncat: Version 7.92 ( https://nmap.org/ncat )
Ncat: No connection could be made because the target machine actively refused it. .

You will receive blank message on Linux netcat, this ussually appear on Linux with UDP not connection case.

Reference

• https://www.digitalocean.com/community/tutorials/how-to-use-netcat-to-establish-and-test-tcp-and-udp-connections
• https://serverspace.io/support/help/how-to-install-ncat-tool-on_windows-and-linux/