How RedHat 8 checks whether the port is connected

stay Linux When debugging, it is very troublesome to check whether the port is connected .

There may be various reasons why the port is not connected , Usually the firewall of the operating system itself , Firewall of hosting server center, etc .

Because the Internet doesn't work , Lead to various problems .

nc Also known as netcat Is your good friend .

install

Run the following command to install , If your dnf Out of commission , Then try it yum

dnf install nc

Linux Of nc The command is used to set up the router .

Execute this instruction to set the relevant parameters of the router .

Execute the command to check the port

You can directly execute the following command , To check whether the specific port of a specific address is open .

nc -z -v 127.0.0.1 10050

Check out the command above IP The address is ：127.0.0.1 Port is ：10050

If the following returns , Indicates that the port is connected .

[[email protected] ~]# nc -z -v 127.0.0.1 10050
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: Connected to 127.0.0.1:10050.
Ncat: 0 bytes sent, 0 bytes received in 0.01 seconds.
[[email protected] ~]# 

If you need to see the specific port of the remote server , Just change a different address .

summary

• It should be noted that ,IP Addresses and ports are separated directly by spaces .
• -z Use 0 Input / The output mode , Only used when scanning the communication port .
• -v Display during execution of instructions .

If you need to know other parameters , Please refer to relevant manuals .

https://www.ossez.com/t/redhat-8/13713