# AC-9(2) — Successful and Unsuccessful Logons

- **Control ID:** AC-9(2)
- **Family:** [AC](/md/families/AC.md)
- **Baselines:** No content available.
- **Enhancement of:** [AC-9](/md/controls/AC-9.md)

## Description

Notify the user, upon successful logon, of the number of \[assignment\] during \[assignment\].

## 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.

## Implementation guidance

No content available.

## CSF 2.0 subcategories

No content available.

## Related controls

No content available.

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Derived from official NIST publications (NIST SP 800-53 Rev 5 and NIST CSF 2.0). nistcontrols.com is not affiliated with NIST.