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Why has my Broadband usage gone so high.

Hi Folks

Since rebuilding our SBS 2000 server a couple of weeks ago our Internet usage has more than doubled. This is freaking me out as I have tried everything I can over the last 3 days now I'm in to the weekend and still no further clues!

Are there any tools I can use to see what is responsible for this traffic / usage?

In a nutshell: -

Netgear FVS328 Firewall/VPN Router
Windows SBS 2000 server
Windows XP Pro PC's

There are no P2P file sharing apps running
Have scanned for all viruses (such as Sober.I mass mailer)
Have turned of Automatic Updates
Have changed password on ISP account to ensure no one has cracked the original
Have enabled logging on firewall but cant seen anything obvious

ALL comments warmly welcomed, I am already bald but I am starting to feel like I may loose my hair again... if that is spossible.

Phil

SOLUTION

grblades

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Joel_Sisko

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vicktheviking

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Okay thanks guys. I will try your suggestions on Monday as soon as I can get access to the LAN and let you know.

vicktheviking

ASKER

I found the GUI tool from Colasoft easy to use and the demo version gave me just about enough time and info to see that my server was sending out loads of SMTP packet to our ISP's mail server.

Now all I gotta do I work out why the SMTP traffic...... but that's another storey.

VickTheViking