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In addtion: each server (master and slave) needs to have a localhost entry in Servers.nmis which tells the server how to log in to itself. NB: it must be 'localhost' in both the key and name portions, 127.0.0.1 will not work!
The Servers nmis file is located at /usr/local/nmis8/conf/Servers.nmis, you will need to add a section for each server the daemon will be connecting to. The NMIS GUI can help you create these entries, to use it load up NMIS on the server you are configuring, and select "System->System Configuration->Servers" from the menu.
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