Bug#1077799: openssh-server: cannot login anymore: error "kex_exchange_identification: read: Connection reset by peer"

Andrea Zagli <[email protected]> writes:

> Colin Watson <[email protected]> writes:
>
>> (CCing the bug report again so that this is archived)
>>
>> On Fri, Aug 02, 2024 at 04:30:35PM +0200, Andrea Zagli wrote:
>>> i think it's disabled
>>> 
>>> ○ ssh.socket - OpenBSD Secure Shell server socket
>>>      Loaded: loaded (/usr/lib/systemd/system/ssh.socket; disabled; preset: enabled)
>>>      Active: inactive (dead)
>>>    Triggers: ● ssh.service
>>>      Listen: [::]:22 (Stream)
>>> 
>>> 
>>> the sshd service starts without problems
>>> 
>>> i tried with a clean sshd_config file, but same problem
>>> 
>>> i downgraded openssh to 9.7 and it works
>>
>> In that case I need all the ssh-related log entries you can give me -
>> "journalctl -u ssh.service --lines=1000", /var/log/auth.log, and so on.
>
>
> the only log produced 
>
> ago 02 16:30:11 deimos sshd[27821]: Received signal 15; terminating.
> ago 02 16:30:11 deimos systemd[1]: Stopping ssh.service - OpenBSD Secure Shell server...
> ago 02 16:30:11 deimos systemd[1]: ssh.service: Deactivated successfully.
> ago 02 16:30:11 deimos systemd[1]: Stopped ssh.service - OpenBSD Secure Shell server.
> ago 02 16:30:25 deimos systemd[1]: Starting ssh.service - OpenBSD Secure Shell server...
> ago 02 16:30:25 deimos sshd[32054]: Server listening on 0.0.0.0 port 22.
> ago 02 16:30:25 deimos sshd[32054]: Server listening on :: port 22.
> ago 02 16:30:25 deimos systemd[1]: Started ssh.service - OpenBSD Secure Shell server.
> ago 02 16:30:29 deimos sshd-session[32063]: refused connect from 10.0.0.99 (10.0.0.99)
>
>
> last line also on auth.log


i set sshd loglevel to debug3 and i found


ago 02 17:06:21 deimos sshd-session[35156]: debug1: Connection refused by tcp wrapper


i have "sshd: ALL" in hosts.allow and "ALL: ALL" in hosts.deny... never
changed these files from years