Audit IPsec Driver

Updated: June 15, 2009

Applies To: Windows 7, Windows Server 2008 R2

This security policy setting determines whether the operating system audits the activities of the IPsec driver and reports any of the following events:

  • Startup and shutdown of IPsec services.

  • Packets dropped due to integrity check failure.

  • Packets dropped due to replay check failure.

  • Packets dropped due to being in plaintext.

  • Packets received with an incorrect Security Parameter Index (SPI). (This can indicate malfunctioning hardware or interoperability problems.)

  • Failure to process IPsec filters.

A high rate of packet drops by the IPsec filter driver may indicate attempts to gain access to the network by unauthorized systems.

Failure to process IPsec filters poses a potential security risk because some network interfaces may not get the protection provided by the IPsec filter.

Event volume: Medium

Default: Not configured

If this policy setting is configured, the following events are generated. The events appear on computers running Windows Server 2008 R2, Windows Server 2008, Windows 7, or Windows Vista.

 

Event ID Event message

4960

IPsec dropped an inbound packet that failed an integrity check. If this problem persists, it could indicate a network issue or that packets are being modified in transit to this computer. Verify that the packets sent from the remote computer are the same as those received by this computer. This error might also indicate interoperability problems with other IPsec implementations.

4961

IPsec dropped an inbound packet that failed a replay check. If this problem persists, it could indicate a replay attack against this computer.

4962

IPsec dropped an inbound packet that failed a replay check. The inbound packet had too low a sequence number to ensure it was not a replay.

4963

IPsec dropped an inbound clear text packet that should have been secured. This is usually due to the remote computer changing its IPsec policy without informing this computer. This could also be a spoofing attack attempt.

4965

IPsec received a packet from a remote computer with an incorrect Security Parameter Index (SPI). This is usually caused by malfunctioning hardware that is corrupting packets. If these errors persist, verify that the packets sent from the remote computer are the same as those received by this computer. This error may also indicate interoperability problems with other IPsec implementations. In that case, if connectivity is not impeded, then these events can be ignored.

5478

IPsec Services has started successfully.

5479

IPsec Services has been shut down successfully. The shutdown of IPsec Services can put the computer at greater risk of network attack or expose the computer to potential security risks.

5480

IPsec Services failed to get the complete list of network interfaces on the computer. This poses a potential security risk because some of the network interfaces may not get the protection provided by the applied IPsec filters. Use the IP Security Monitor snap-in to diagnose the problem.

5483

IPsec Services failed to initialize RPC server. IPsec Services could not be started.

5484

IPsec Services has experienced a critical failure and has been shut down. The shutdown of IPsec Services can put the computer at greater risk of network attack or expose the computer to potential security risks.

5485

IPsec Services failed to process some IPsec filters on a plug-and-play event for network interfaces. This poses a potential security risk because some of the network interfaces may not get the protection provided by the applied IPsec filters. Use the IP Security Monitor snap-in to diagnose the problem.

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