Cannot get nagios to connect to LAN server

Server being monitored, server 2003 and firewall is off

Hey there, first try at nagios. I thought I had followed the instrux correctly, however, in the status information "could not fetch from server, and on the server I am trying to monitor, in the nsclient.log we have “error:.\NSClientListener.cpp:296: Unauthorized access from: 10.0.0.75”. I used to get a red message on the nagios monitoring page “connection refused”.

I un-remarked all of the mods listed in the quickstart guide and un-remarket the port 12489

I made the service 'allowed to interact with desktop"

What am I missing?