[Nut-upsuser] Can't get NUT slave to connect to master

[Roger Price]

On Thu, 24 Nov 2016, Jonah Naylor wrote:

> The servers can ping each other... The router log doesn't show anything 
> and I am the admin for the servers. The machines firewalls allow each 
> other's ips etc. Part of the issue is possibly that I just don't know if 
> I've set up NUT correctly for this arrangement? Like I say it works ok 
> on LAN, but not across networks. Is there something I should be doing 
> other than adding "allowfrom = ipaddressofslave" to the upsd.users file 
> on the master?

Does your NUT have TCP wrappers compiled in?  In that case is 
/etc/hosts.allow on the master set to allow the traffic?

When you issue a NUT command on the slave, addressed to the master, does 
tcpdump on the master's subnetwork show the traffic to port 3493?

Roger