The things I would do first thing:
Can you SSH to localhost on port 22? If not, then check to see if the port is listening using netstat -an | grep 22
Run nmap from another system on that subnet to that machine to see if port 22 is available on the network if the above is fine.
My guess is that ssh isn't bound to the NIC and not listening on port 22. Last resort would be to shut down the firewall and test it that way. (If it's a true 'public' server, I wouldn't just leave the FW down if that fixes it. But it will give you a place to start.)
On Thu, Sep 8, 2016 at 2:43 PM, Ron Leach <ronleach@xxxxxxxxx> wrote:
Running F23/XFCE, with firewalld, and having commanded:
# systemctl start sshd.service
/var/log/secure
shows that sshd is opening port 22, and listening on 0.0.0.0 .
There is no entry suggesting a login attempt is received.
In the XFCE GUI for firewalld, everything is running in zone labelled 'public'.
- The network interface is bound to the zone 'public'
- SSH service is enabled in zone 'public'
- I've added port 22/tcp to the list of active ports in zone 'public'
- 'Lockdown', and 'panic mode' are disabled
These settings are the same in mode 'permanent' and in mode 'runtime'
sshd config is set to listen on 0.0.0.0 (and ::).
Our LAN uses ipv4, in the range 192.168.0/24 .
This machine is connected to the network, but I cannot log in to sshd from any machine on the LAN. The client times-out after a few seconds. Clients do not report a 'rejection'.
If any list readers have any ideas about what else might need to be set up, or might be going wrong, I'd be very grateful to hear,
Ron
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