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EXPLOIT kerberos principal name overflow TCP

Is this anything I should worry about?

I had Excepted my laptop from IPS, but decided to submit it to the checks.  This is the only Alert I get.  Normally, there's nothing, then there will be a burst of about 15.  I only connect via VPN to our Astaro.  The server is our SBS2003 running Exchange, AD, DHCP, DNS, etc.  My laptop is Vista Pro SP1.
Message........: EXPLOIT kerberos principal name overflow TCP
Details........: http://www.snort.org/pub-bin/sigs.cgi?sid=2579
Time...........: 2009:06:01-10:16:01
Packet dropped.: yes
Priority.......: 1 (high)
Classification.: Attempted Administrator Privilege Gain
IP protocol....: 6 (TCP)

Source IP address: 10.x.x.51 

Source port: 18345

Destination IP address: 10.x.x.7 (server.company.local)

Destination port: 88 (kerberos)

Cheers - Bob


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