In this case, "access denied" means the access to upsd(8), not the
device communication port. You’re being denied since the system has no
permission to speak to upsd
according to its access controls.
There can be due to various reasons. To fix it, check:
hosts.allow
and hosts.deny
) if used.
Refer to the upsd(8) and upsd.conf(5) man pages for more information.