Re: Unable to ssh to Debian 9 from 9 or 11
On Sun, 16 Jul 2023, Anssi Saari wrote:
Roger Price <debian@rogerprice.org> writes:
Does the style of comment give a clue to the tool used ?
Earlier you posted a list of firewall rules like this:
iptables -L -n --line-numbers reports
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ufw-before-logging-input all -- 0.0.0.0/0 0.0.0.0/0
So I would guess ufw.
That's what I thought, but there is no ufw in this Debian 9 machine. So I had
to do some archaeology.
It took me a while to discover that long ago this machine ran openSuSE 12.2 and
was directly attached to the internet, so it ran a modification of the openSuSE
firewall. The machine was then migrated to Debian and placed behind a box
supplied by the internet provider, but it kept running the openSuSE firewall.
root@kananga ~ systemctl is-enabled SuSEfirewall2
enabled
The years have gone by. It's still running on Debian 9!. I stopped it with
root@kananga ~ systemctl disable SuSEfirewall2
Removed /etc/systemd/system/SuSEfirewall2_setup.service.
Removed /etc/systemd/system/multi-user.target.wants/SuSEfirewall2.service.
Removed /etc/systemd/system/multi-user.target.wants/SuSEfirewall2_init.service.
root@kananga ~ systemctl stop SuSEfirewall2
root@kananga ~ systemctl is-enabled SuSEfirewall2
disabled
I then recycled the machine, power off, power on, and I can now ssh into this
Debian 9 machine from Debian 11 :-) , so I have a permanent solution.
My thanks to all who participated in the discussion, Roger
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