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.