netcat listener Error: Couldn't setup listening socket (err=-3)

Sora0 · 2023-04-18 02:11:20

when I try to setup normal net cat listener via this command

nc -lvnp 87

it gives this error msg

Error: Couldn't setup listening socket (err=-3)

when i use port 1234 or run it as sudo it just hangs with no response

mpan · 2023-04-18 03:07:14

To listen on ports below 1024, the process must be run as root or have CAP_NET_BIND_SERVICE capability.

Last edited by mpan (2023-04-18 03:07:33)

seth · 2023-04-18 06:54:40

when i use port 1234 or run it as sudo it just hangs with no response

… or maybe, just maybe, it's listening on the port…

Sora0 · 2023-04-18 20:54:10

mpan wrote:

To listen on ports below 1024, the process must be run as root or have CAP_NET_BIND_SERVICE capability.

when i run it with root it just appears like this:

and i am sure no other service is listening to this port

Last edited by Sora0 (2023-04-18 20:55:25)

seth · 2023-04-18 20:58:55

Do you understand what netcat is and does?

Open two terminals, in one run

netcat -lp 1234

and in the other

echo snafu | netcat localhost 1234

Arch Linux