One Port has 2 status (established and listen), how can it happen?

Question

I'm monitoring my server's port assignment and found a strange thing...

I used IBM Websphere Liberty and found that one port has 2 status(listening and established...), that's odd...

10318 is my listening port for this liberty server...But it has 2 status...

So could anyone can explain to me about this?

I thought that one port can only has one status at one time...

Thanks so much!

Answer 1

Notice the connection number is different between the listener and established sockets. As long as the combination of the 4 numbers of local port and socket and foreign port and socket is unique, you can establish multiple sockets, ie in your netstat output, 9.20.4.125..3305 can't establish another connection to 9.20.4.125..10318.