restrict specific port access only to root user

gibigibi · 05-14-2015, 01:20 AM

Hello everyone,

I want to restric a port (let's say port 9000) to be listenable only by root user. By default Linux does this for ports under 1024 but for ports above it I didn't find any method to do this. What are your suggestions ?

Thx

pan64 · 05-14-2015, 01:52 AM

root should start that app (and listening on port 9000) and nobody else will be able to listen on it.

gibigibi · 05-14-2015, 04:43 AM

There might be no app running and listening. I want that port to be not listenable by other users when it is not in use.

chrism01 · 05-15-2015, 08:54 AM

That's not really how Linux is designed; short of having a cron job or similar to check/kill procs on 9000 I think you're going to struggle.
There are plenty of ports under 1024 that are not actually used; any reason you can't just use one of them?