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Event ID: 20193 Source: IPRouterManager

Level
Description
An error occured while configuring IP packet filters over <connection>. This is often the result of another service, e.g Microsoft Proxy Server, also using the Windows 2000 filtering services.
Comments
 
This event appeared on a Windows 2003/ISA2000/RRAS server that had an extra demand dial VPN interface. Something that I could not find sent interesting traffic and imitated the demand dial interface connection, which failed because there is no other end to it. Following this were constant false spoof attacks (event 15108) detected on the ISA server where all the publishing rules failed and incoming packets on all the published ports were detected as attacks. To fix the problem, I disabled the extra Demand Dial interface in RRAS.

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