Re: Cannot see a process listening on 127.0.0.1

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From	Dan Ritter <dsr@randomstring.org>
Newsgroups	linux.debian.user
Subject	Re: Cannot see a process listening on 127.0.0.1
Date	Thu, 20 Aug 2020 13:20:01 +0200
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Victor Sudakov wrote: 
> Dan Ritter wrote:
> > > 
> > > 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
> 
> Nope, the -4 flag does not help:
> 
> root@test4:~# telnet localhost 8081
> Trying 127.0.0.1...
> Connected to localhost.
> Escape character is '^]'.
> dd
> HTTP/1.1 400 Bad Request
> Connection: close
> 
> Connection closed by foreign host.
> root@test4:~# netstat -4lpn | grep 8081
> root@test4:~# 
> 

That's a bug, then.

-dsr-

Thread

Cannot see a process listening on 127.0.0.1 Victor Sudakov <vas@sibptus.ru> - 2020-08-20 07:30 +0200
  Re: Cannot see a process listening on 127.0.0.1 Dan Ritter <dsr@randomstring.org> - 2020-08-20 13:00 +0200
    Re: Cannot see a process listening on 127.0.0.1 Victor Sudakov <vas@sibptus.ru> - 2020-08-20 13:10 +0200
      Re: Cannot see a process listening on 127.0.0.1 Dan Ritter <dsr@randomstring.org> - 2020-08-20 13:20 +0200
        Fw: Cannot see a process listening on 127.0.0.1 Matthew Campbell <trenix25@pm.me> - 2020-08-20 14:40 +0200
  Re: Cannot see a process listening on 127.0.0.1 Andy Smith <andy@strugglers.net> - 2020-08-20 14:50 +0200
    Re: Cannot see a process listening on 127.0.0.1 Victor Sudakov <vas@sibptus.ru> - 2020-08-25 05:40 +0200
      Re: Cannot see a process listening on 127.0.0.1 Anssi Saari <as@sci.fi> - 2020-08-25 10:20 +0200
        Re: Cannot see a process listening on 127.0.0.1 Victor Sudakov <vas@sibptus.ru> - 2020-08-26 04:20 +0200

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