See : http://assets.nagios.com/downloads/nrdp/docs/NRDP_Overview.pdf
Nagios Remote Data Processor (NDRP) is a flexible data transport mechanism and processor for Nagios. It is designed with a simple and powerful architecture that allows for it to be easily extended and customized to fit individual users' needs. It uses standard ports protocols (HTTP(S) and XML) and can be implemented as a replacement for NSCA.
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