On Montag 2023-07-17 12:44, Andrei Borzenkov wrote:

>Date: Mon, 17 Jul 2023 12:44:53
>From: Andrei Borzenkov <arvidjaar@gmail.com>
>To: users@lists.opensuse.org
>Subject: Re: ssh connection failes (times out)
>
> On Mon, Jul 17, 2023 at 1:15 PM Paul Neuwirth <mail@paul-neuwirth.nl> wrote:
>>
>> On Montag 2023-07-17 11:42, Andrei Borzenkov wrote:
>>
>>> Date: Mon, 17 Jul 2023 11:42:11
>>> From: Andrei Borzenkov <arvidjaar@gmail.com>
>>> To: users@lists.opensuse.org
>>> Subject: Re: ssh connection failes (times out)
>>>
>>> On Mon, Jul 17, 2023 at 12:18 PM Paul Neuwirth <mail@paul-neuwirth.nl> wrote:
>>>
>>>>
>>>> nothing to see for me. (where does the "noprefixroute" come from?)
>>>>
>>>
>>> It comes from NetworkManager
>>>
>>> Well, I would simply capture packets on this host when ssh connection
>>> is attempted. Then you at least know whether any request comes through
>>> or not.
>>>
>> seems so, tcpdump shows repeatingly those lines on trying to connect:
>> 12:06:51.525602 IP stb1.swabian.net.43562 > omega.swabian.net.ssh: Flags
>> [S], seq 3512370883, win 29200, options [mss 1460,sackOK,TS val 8907069
>> ecr 0,nop,wscale 6], length 0
>>
>
> This is an incoming TCP connection request. Do you also see any reply
> on this interface?

no, nothing. also nothing showing up (dropped packets or so) in dmesg.

>
>> 12:07:31.105170 IP alpha.swabian.net.39586 > omega.swabian.net.ssh:
>> Flags [S], seq 2839271321, win 29200, options [mss 1460,sackOK,TS val
>> 861540940 ecr 0,nop,wscale 7], length 0
>>
>> sshd is definitively listening...
>> # netstat -lntp
>> Active Internet connections (only servers)
>> Proto Recv-Q Send-Q Local Address           Foreign Address
>> State       PID/Program name
>> tcp        0      0 0.0.0.0:111             0.0.0.0:*
>> LISTEN      1/systemd
>> tcp        0      0 127.0.0.1:7634          0.0.0.0:*
>> LISTEN      1935/hddtemp
>> tcp        0      0 0.0.0.0:22              0.0.0.0:*
>> LISTEN      1003/sshd: /usr/sbi
>> tcp        0      0 127.0.0.1:25            0.0.0.0:*
>> LISTEN      2377/master
>>
>