Microsoft KB Archive/252468

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Knowledge Base

Event ID 120 "The Proxy Service Could Not Create a Packet Filter"

Article ID: 252468

Article Last Modified on 8/6/2002


  • Microsoft Proxy Server 2.0 Standard Edition

This article was previously published under Q252468


You may see the following event in Event Viewer:

Event 120, Source WebProxyServer, Description:The proxy service could not create a packet filter.


This event occurs when more than 20 packets are filtered by a Proxy Server packet filter rule. 20 of these events in the packet filter log trigger event ID 120.

You see Pfxxxxxx.log files, where xxxxxx is the date of the log file, in the Packet Filter logs located in the %SystemRoot%\System32\Msplogs folder.

You may see an entry with a form similar to:

2/14/00, 7:47:37,,, Udp, 520, 520, -, 0,, -, -,

This entry shows that on 2/14/2000, a UDP packet from destined for the broadcast address was filtered successfully (0 = blocked packet) on the interface.


This behavior is by design.

Keywords: kberrmsg kbprb KB252468