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Un-Explained Network Traffic From XP Client to 2K3 Server

Hi,

I noticed the other day at a clients that the little network icon in the bottom right of the taskbar was always lit. Upon inspecition it showed constant traffic in and out.

A person on EE suggested that I use traffic shaper XP to see the details. So I installed it and it does show unusual traffic. Please see the screenshot below. The traffic is always 300+ K and goes constantly to the file/print server. Offline files on the desktop is not configured, and a virus scan and anti-malware scan shows clean. The user has noticed some performance slow downs.

Any help on what is it, or how to stop it would be greatly appreciated.
network-traffic.jpg
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oalva

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oalva

port 139 is netbios.
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Sorry for the delay I will be back on-site tomorrow and will checkup.
These answeres helped. However they had a power failure and the server rebooted. After that there has been no unusual traffic.