Windows Security Log Event ID 4649
Operating Systems Windows 2008 R2 and 7
Windows 2012 R2 and 8.1
Windows 2016 and 10
Category
 • Subcategory
Logon/Logoff
 • Other Logon/Logoff Events
Type Success
Corresponding events
in Windows 2003
and before
 
Discussions on Event ID 4649
Event code :4649 A replay attack was detected sample logs
KRB_AP_ERR_REPEAT during IIS worker process crash

4649: A replay attack was detected

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I haven't been able to produce this event. Have you? If so, please start a discussion (see above) and post a sample along with any comments you may have! Don't forget to sanitize any private information.

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A replay attack was detected.

Subject:
   Security ID:  %1
   Account Name:  %2
   Account Domain:  %3
   Logon ID:  %4

Credentials Which Were Replayed:
   Account Name:  %5
   Account Domain:  %6

Process Information:
   Process ID:  %12
   Process Name:  %13

Network Information:
   Workstation Name: %10
Detailed Authentication Information:
   Request Type:  %7
   Logon Process:  %8
   Authentication Package: %9
   Transited Services: %11

This event indicates that a Kerberos replay attack was detected- a request was received twice with identical information. This condition could be caused by network misconfiguration.

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