Windows Security Log Event ID 4649

Operating Systems Windows 2008 R2 and 7
Windows 2012 R2 and 8.1
Windows 2016 and 10
Windows Server 2019 and 2022
 • Subcategory
 • Other Logon/Logoff Events
Type Success
Corresponding events
in Windows 2003
and before

4649: A replay attack was detected

On this page

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.

Free Security Log Resources by Randy

Supercharger Free Edition

Centrally manage WEC subscriptions.



Examples of 4649

A replay attack was detected.

   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.

Top 10 Windows Security Events to Monitor

Free Tool for Windows Event Collection


Additional Resources