Logon Logoff Event: 5451

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The Who, Where and When information is very important for an administrator to have complete knowledge of all activities that occur on their Active Directory. This helps them identify any desired / undesired activity happening. ADAudit Plus assists an administrator with this information in the form of reports. In real-time, ensure critical resources in the network like the Domain Controllers are audited, monitored and reported with the entire information on AD objects - Users, Groups, GPO, Computer, OU, DNS, AD Schema and Configuration changes with 200+ detailed event specific GUI reports and email alerts.

Logon Logoff » Logon Logoff Event: 5451

Event ID 5451 – An IPsec Quick Mode Security Association Was Established

Event ID 5451
Category Logon/Logoff
Sub-Category Audit IPsec Quick Mode
Description An IPsec Quick Mode security association was established.

Example of 5451 log:

An IPsec Quick Mode security association was established.


Local Endpoint:

Network Address: %1

Network Address mask: %2

Port: %3

Tunnel Endpoint: %4


Remote Endpoint:

Network Address: %5

Network Address Mask: %6

Port: %7

Private Address: %8

Tunnel Endpoint: %9

Protocol: %10

Keying Module Name: %11


Cryptographic Information:

Integrity Algorithm - AH: %12

Integrity Algorithm - ESP: %13

Encryption Algorithm: %14


Security Association Information:

Lifetime - seconds: %15

Lifetime - data: %16

Lifetime - packets: %17

Mode: %18

Role: %19

Quick Mode Filter ID: %20

Main Mode SA ID: %21

Quick Mode SA ID: %22


Additional Information:

Inbound SPI: %23

Outbound SPI: %24

Virtual Interface Tunnel ID: %25

Traffic Selector ID: %26

Note: Only computers running Windows 7 or Windows Server 2008 will have Virtual Interface Tunnel ID and Traffic Selector ID data available in the 5451 logs.

Why does event ID 5451 need to be monitored?

Security events which fall under the Audit IPsec Quick Mode subcategory are monitored primarily for IPsec Quick Mode troubleshooting.

Pro Tip:

With in-depth reports, real-time alerts, and graphical displays, ADAudit Plus tracks all IPsec security associations, helping you meet your security, operational, and compliance needs with absolute ease.

Event 5451 applies to the following operating systems:

  • Windows Server 2016
  • Windows 10
  • Windows Server 2008
  • Windows 7

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