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I have a server at Rackspace and noticed my server is suddenly sending out 2GB of data per month (this is atypical since I don't use it that much)

How can I figure out what application is using that bandwith and who is consuming it?

I suppose it would also be beneficial to see how much data is incoming too...

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Perhaps a stand-alone light-weight SysInternals tool like Process Monitor can suit your needs.
Network activity is just one of the many events that this tool can monitor/filter/highlight/…

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