Take a look at these resources:
How to monitor server connections, load, and application statistics
This article provides information about how to use Wowza Streaming Engine™ Manager to monitor the server and streaming applications. Comprehensive metrics deliver real-time data about CPU and memory usage, connection counts, client players, applications, and network statistics.
For quick reference, this URL is very insightful:
How to blacklist by IP (ModuleOverridePlayBlackListIP)
This article describes how to use the ModuleOverridePlayBlackListIP module to override play and blacklist (refuse connection) by IP address.