Too many packet sent (Windows)

Hello all,
I am working in a company. Our company is using Windows Proxy Server. Recently, the ISP provider complains that we are sending many packet out.
Attached -- the output of netstat. (proxy2 is our proxy machine)

I saw that there are many HTTP connection to ISP in other countries. Those IP is not publicly accessable. So, I think it is our problem.

Anyone know how I can prevent the machine sending out packet to those IP? Or, find out what program is sending out those packet.

*I have run Norton antivirus and found nothing

Thanks

 

 

 

 

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