Re: Cannot see a process listening on 127.0.0.1

[Dan Ritter <dsr@randomstring.org>]

Victor Sudakov wrote: 
> Dear Colleagues,
> 
> There is a process listening on 127.0.0.1:8081 but for some reason
> netstat/sockstat/ss do not show it listening on IPv4. Is this a bug or a
> feature?
> 
> root@test4:~# telnet 127.0.0.1 8081
> Trying 127.0.0.1...
> Connected to 127.0.0.1.
> Escape character is '^]'.
> dd
> HTTP/1.1 400 Bad Request
> Connection: close
> 
> Connection closed by foreign host.
> root@test4:~# netstat -lpn | grep 8081
> tcp6       0      0 :::8081                 :::*                    LISTEN      10872/node /home/ad 

Feature-bug. It's listening on both IPv4 and IPv6; if you want to
see them differently, add the 4 or 6 flag to netstat

-dsr-