Previous Logon Notification
LOW MODERATE HIGHRequirements NIST SOURCE
Notify the user, upon successful logon to the system, of the date and time of the last logon.
Discussion (NIST Supplemental Guidance)
Previous logon notification is applicable to system access via human user interfaces and access to systems that occurs in other types of architectures. Information about the last successful logon allows the user to recognize if the date and time provided is not consistent with the user’s last access.
Enhancements NIST SOURCE
AC-9(1) Unsuccessful Logons LOW MODERATE HIGH
Notify the user, upon successful logon, of the number of unsuccessful logon attempts since the last successful logon.
Discussion
Information about the number of unsuccessful logon attempts since the last successful logon allows the user to recognize if the number of unsuccessful logon attempts is consistent with the user’s actual logon attempts.
AC-9(2) Successful and Unsuccessful Logons LOW MODERATE HIGH
Notify the user, upon successful logon, of the number of [one of: successful logons; unsuccessful logon attempts; both] during [time period].
Discussion
Information about the number of successful and unsuccessful logon attempts within a specified time period allows the user to recognize if the number and type of logon attempts are consistent with the user’s actual logon attempts.
AC-9(3) Notification of Account Changes LOW MODERATE HIGH
Notify the user, upon successful logon, of changes to [security-related characteristics or parameters] during [time period].
Discussion
Information about changes to security-related account characteristics within a specified time period allows users to recognize if changes were made without their knowledge.
AC-9(4) Additional Logon Information LOW MODERATE HIGH
Notify the user, upon successful logon, of the following additional information: [additional information].
Discussion
Organizations can specify additional information to be provided to users upon logon, including the location of the last logon. User location is defined as information that can be determined by systems, such as Internet Protocol (IP) addresses from which network logons occurred, notifications of local logons, or device identifiers.
Implementation Guidance
Original engineering commentary written for this explorer — not NIST source text and not authoritative guidance.
No engineering interpretation has been authored for AC-9 yet. This section is architected to receive it — see the Requirements and Assessment sections above for the authoritative NIST source content in the meantime.
Assessment
Assessment Objectives
- the user is notified, upon successful logon to the system, of the date and time of the last logon.
Examine
[SELECT FROM: Access control policy; procedures addressing previous logon notification; system design documentation; system configuration settings and associated documentation; system notification messages; system security plan; other relevant documents or records].
Interview
[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; system developers].
Test
[SELECT FROM: Mechanisms implementing access control policy for previous logon notification].
STIGs & CCIs
No STIG checks or CCI mappings are currently loaded for AC-9. This section is architected to display, per product: STIG ID, Finding ID, Severity, Title, Description, Check, Fix, CCI, and NIST control mapping — but nothing is populated here until a real DISA STIG/CCI dataset is ingested.
Learn more about STIG/CCI integration →Evidence
Categorized from the SP 800-53A "Examine"/"Test" artifact list above by keyword — not an authoritative NIST evidence list.
Policy
- Access control policy
- system security plan
Configuration
- system design documentation
- system configuration settings and associated documentation
Testing
- Mechanisms implementing access control policy for previous logon notification
Other Records
- procedures addressing previous logon notification
- system notification messages
- other relevant documents or records