On Wed, 16 Feb 2022, William Cole via Nut-upsuser wrote:

I ran telnet on both machines:
   First from the server [235] to the client [236]
   Then from the client [236] to the server [235]

The result in both cases:
   Trying 192.168.1.xxx
   telnet: Unable to connect to remote host: Connection refused.

This makes it clear that the problem is not with nut, but rather the basic setup of network 192.168.1/24 Google proposes plenty of help for Connection refused, but start with command

 netstat -lntp

For example, I see

 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      0.0.0.0:*        LISTEN  832/sshd
 ...
 tcp        0      0 0.0.0.0:3493    0.0.0.0:*        LISTEN  3066/upsd

Roger
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