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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