Network Miner is a portable Open Source network security analysis tool that can monitor the traffic of a connected network adapter in the Windows operating system. It utilizes a build in passive network sniffer / packet capturing tool that can detect IPs, hostnames, operating systems, ports and various other information of every connection. The network security tool requires the – separate – installation of WinPcap to function properly and reliable.
The main purpose of Network Miner is data collection for future analysis (such as forensic evidence analysis) rather than collecting data regarding the traffic on the network. Information are grouped by host rather than by packets or frames although it is possible to switch the view modes easily in the software interface.
Network Miner can – among other things – extract files and certificates transferred over the network. This can be used to save media files that are streamed across the network.

Another interesting ability is the extraction of user credentials – that is usernames and passwords for supported protocols which are then displayed in the credentials tab in Network Miner.
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Don’t work on Win Server 2003 or Win XP x64 keeps coming up with an error cant find winpcap even if you install it, then it comes up with an error saying it cant find .Net 2.0 which i also have installed. Bad Job!!
oh no take it back it works on Win Server 2003, i was running it form a share.
I prefer to work on Mac and I use ProteMac Meter for it.