How to get rid of client disconnected network sockets

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From	Marcel Mueller <news.5.maazl@spamgourmet.org>
Newsgroups	comp.os.linux.networking
Subject	How to get rid of client disconnected network sockets
Date	Thu, 12 Jun 2025 12:54:16 +0200
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Hello!

from time to time network sockets are stuck for a very long time when 
the client is no longer online:

netstat -4np
> tcp        0      0 192.168.121.129:40830   192.168.121.1:49000     VERBUNDEN   1449463/vdr         
> tcp        0      0 192.168.121.129:2049    192.168.121.137:939     VERBUNDEN   -                   
> tcp        0      0 192.168.121.129:2049    192.168.121.139:912     VERBUNDEN   -                   
> tcp       45      0 192.168.121.129:5143    192.168.121.24:41072    VERBUNDEN   -                   
> tcp        0      0 192.168.121.129:22      192.168.121.137:55826   VERBUNDEN   1475830/sshd-sessio 
> tcp        0      0 192.168.121.129:2049    192.168.121.143:857     VERBUNDEN   -                   
> tcp        0      0 192.168.121.129:22      192.168.121.137:42194   VERBUNDEN   1479707/sshd-sessio 
> tcp       45      0 192.168.121.129:5143    192.168.121.24:43014    VERBUNDEN   -                   
> tcp       45      0 192.168.121.129:5143    192.168.121.33:56454    VERBUNDEN   -                   
> tcp        0      0 192.168.121.129:5143    192.168.121.33:52444    VERBUNDEN   1460557/VBoxHeadles 

The clients 192.168.121.24 is disconnected for at least an hour, but the 
sockets at the server seem to stay for an infinite time.
At some point I can no longer connect to the service at :5143. The 
client software (xfreerdp) just hangs.

The only way to recover from this state is to end the listening process. 
Since this is a virtual machine this option is not very applicable.

The lost connections are often related to client network disconnects, 
e.g. by a laptop entering suspend or WLAN interference. But this should 
result in a socket with state CLOSE_WAIT which is cleaned up after a 
short time. Of course, it is not reproducible. It happens only from time 
to time.

How can I force the sockets to disconnect?

System is Debian 13 running VBox headless VMs. (I do not use VBox NAT.)


Marcel

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Thread

How to get rid of client disconnected network sockets Marcel Mueller <news.5.maazl@spamgourmet.org> - 2025-06-12 12:54 +0200
  Re: How to get rid of client disconnected network sockets [changing tcp_keep_alive timeouts] Andrzej Adam Filip <anfi@onet.eu> - 2025-06-12 13:24 +0200
    Re: How to get rid of client disconnected network sockets [changing tcp_keep_alive timeouts] Marcel Mueller <news.5.maazl@spamgourmet.org> - 2025-06-14 14:35 +0200
  Re: How to get rid of client disconnected network sockets Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-06-12 21:53 +0000
    Re: How to get rid of client disconnected network sockets Computer Nerd Kev <not@telling.you.invalid> - 2025-06-13 22:38 +1000
      Re: How to get rid of client disconnected network sockets Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-06-13 23:40 +0000
      Re: How to get rid of client disconnected network sockets Marcel Mueller <news.5.maazl@spamgourmet.org> - 2025-06-14 11:56 +0200
        Re: How to get rid of client disconnected network sockets Lawrence D'Oliveiro <ldo@nz.invalid> - 2025-06-14 23:37 +0000
        Re: How to get rid of client disconnected network sockets candycanearter07 <candycanearter07@candycanearter07.nomail.afraid> - 2025-06-18 05:30 +0000
          Re: How to get rid of client disconnected network sockets Marcel Mueller <news.5.maazl@spamgourmet.org> - 2025-06-18 10:00 +0200

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