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It will be part of the next NMIS release, and incrementally grow in functionality; the first version already provides a convenient way to collect all relevant info regarding an NMIS server's status and configuration for troubleshooting purposes.
The first newest version of this tool can be downloaded here: NMIS support tool version 1.0. 1 (NMIS 8.5G and newer ship with the support tool.) It needs to be saved in the admin/ directory of your NMIS installation; most commonly that would be /usr/local/nmis8/admin/.
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