Unsuccessful Logons
LOW MODERATE HIGHRequirements NIST SOURCE
Notify the user, upon successful logon, of the number of unsuccessful logon attempts since the last successful logon.
Discussion (NIST Supplemental Guidance)
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.
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(1) 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, of the number of unsuccessful logon attempts since the last successful logon.
Examine
[SELECT FROM: Access control policy; procedures addressing previous logon notification; system design documentation; system configuration settings and associated documentation; system audit records; 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(1). 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 audit records
- other relevant documents or records