[solved] SSH client stops after a few minutes without error

[kro]

Hello,

I've just installed a fresh buster on one of my computers (an intel nuc called micropoutre)

I face a stability issue witch seems to come from the client side : whatever server I'm connecting to the connexion stops after a few minutes (varying duration, generally less than 5 minutes).

the server side shows this kind of messages :

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Received disconnect from XX.XX.XX.XX port 59808:11: disconnected by user

on the client side I get some information thanks to -vvvv option, but unfortunately I don't understand much.
here for a connexion to a raspberry :

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pi@raspberrypi ~  debug3: send packet: type 80
debug3: receive packet: type 82
debug3: send packet: type 80
debug3: receive packet: type 82
debug3: send packet: type 80
debug3: receive packet: type 82
debug3: send packet: type 80
debug3: receive packet: type 82
debug3: send packet: type 1
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 client-session (t4 r0 i0/0 o0/0 e[write]/0 fd 4/5/6 sock -1 cc -1)

debug3: fd 1 is not O_NONBLOCK
Killed by signal 15.
krodelabestiole@micropoutre ~

The connexion to every server always ends with this exact same message :

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debug3: send packet: type 1
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 client-session (t4 r0 i0/0 o0/0 e[write]/0 fd 4/5/6 sock -1 cc -1)

debug3: fd 1 is not O_NONBLOCK
Killed by signal 15.

I don't have any connexion issue to the same servers with other distributions (ubuntu 18.04 or solus) from the same local network, and I didn't have any issue with the intel nuc and the same servers when it was running jessie.
I've tried different setup for ServerAliveInterval without success. I guess the problem is somewhere else (and it works fine without this directive on ubuntu 18.04).

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krodelabestiole@micropoutre ~  ssh -V
OpenSSH_7.9p1 Debian-4, OpenSSL 1.1.1a  20 Nov 2018

/etc/ssh/ssh_config looks like this :

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/etc/ssh/ssh_config
Host *
    SendEnv LANG LC_*
    HashKnownHosts yes
    GSSAPIAuthentication yes
    ServerAliveInterval 5

Any help or idea would be much appreciated, thank you !

[kro]

arf arf arf… i'm very ashamed :

I had a task cron I restored from my jessie backup I didn't notice. it was checking the existence of some processus and relaunch some service in case of failure, killing SSH on the way every 5 minutes...

argh sorry about that...