[Nut-upsuser] NUT Client Not Working, Server OK

[William Cole]

Thank you all for your offerings.  Here are some results.  All were run on
the Pi server [235] except the change to the firewall setting which was run
on the Mint machine.

*sudo netstat -lntp*
*Active Internet connections (only servers)*

*Proto  Recv-Q  Send-Q  Local Address             Foreign Address
State       PID/Program name*
*tcp     0            0          0.0.0.0:22
<http://0.0.0.0:22>                    0.0.0.0:*                 LISTEN
501/sshd*
* tcp     0            0          0.0.0.0:631 <http://0.0.0.0:631>
                 0.0.0.0:*                 LISTEN     28384/cupsd*

* tcp     0            0          0.0.0.0:445 <http://0.0.0.0:445>
                 0.0.0.0:*                 LISTEN     1011/smbd *
* tcp     0            0          0.0.0.0:3493 <http://0.0.0.0:3493>
              0.0.0.0:*                 LISTEN    499/upsd *
* tcp     0            0          0.0.0.0:139 <http://0.0.0.0:139>
                 0.0.0.0:*                 LISTEN     1011/smbd*
* tcp6   0            0          :::22
:::*                         LISTEN     501/sshd *
* tcp6   0            0          :::631
:::*                         LISTEN     28384/cupsd *
* tcp6   0            0          :::445
:::*                         LISTEN     1011/smbd*
* tcp6   0            0          :::139
:::*                         LISTEN     1011/smbd *
* tcp6   0            0          :::00
:::*                         LISTEN     530/apache2*

and the second output:

*sudo iptables -L -n -v*
*Chain INPUT (policy ACCEPT @ packets, 0 bytes)*

*   pkts bytes target     prot opt in     out
source                           destination*

*Chain FORWARD (policy ACCEPT @ packets, 0 bytes)*
*   pkts bytes target     prot opt in     out
source                           destination*

*Chain OUTPUT (policy ACCEPT @ packets, 0 bytes)*
*   pkts bytes target     prot opt in     out
source                           destination*

As to firewalls, the Mint 20 that handles Linux network devices uses *Gufw*.

The Windows networked devices use* Windows Defender's* built-in firewall.

I added port 23 for telnet to the Gufw firewall and restarted the Mint
machine and both of the Pis.  Then ran:

*sudo telnet 192.168.1.236* from the 235 Pi
*sudo telnet 192.168.1.235* from the 236 Pi

Result in both cases:

*Trying 192.168.1.xxx ...*
*telnet: Unable to connect to remote host: Connection refused*.

If it makes a difference, all the devices are tied together with Plume mesh
network devices which are connected to FiOS.

Bill

-- 

Fredericksburg, VA
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