Security checks / Check reference / Logging & threat detection
Log Blocked Signin Bad IP Or Too Many Invalid Attempts
Critical Severity Microsoft 365 security check in the Logging & threat detection domain.
Sign-in blocked due to bad IP reputation or too many invalid attempts. May indicate brute-force or credential stuffing attack Blocked attempts indicate active attack; lack of reaction allows repeated retries via other paths Siemserva runs this check automatically across your tenant and maps every finding to the compliance frameworks below.
Check summary
What this check verifies
Sign-in blocked due to bad IP reputation or too many invalid attempts. May indicate brute-force or credential stuffing attack
Why it matters
Blocked attempts indicate active attack; lack of reaction allows repeated retries via other paths
How to fix it
Review blocked events; tune detection to reduce noise while maintaining protection
Siemserva flags every tenant where this check fails and, with Senserva Trustworthy AI remediation, can propose a validated fix you approve before it applies.
Ask your own AI about this check
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Compliance framework mappings
Findings from this check serve as evidence for:
References
Related Logging & threat detection checks
Common questions
What does the Log Blocked Signin Bad IP Or Too Many Invalid Attempts check verify?
Sign-in blocked due to bad IP reputation or too many invalid attempts. May indicate brute-force or credential stuffing attack It is a Critical Severity check in the Logging & threat detection domain, one of the 650+ checks Siemserva runs across Microsoft 365, Intune, Defender, and Entra ID.
How do I fix a Log Blocked Signin Bad IP Or Too Many Invalid Attempts finding?
Review blocked events; tune detection to reduce noise while maintaining protection Siemserva ranks the finding by Severity and, with Senserva Trustworthy AI, can propose a validated, approve-before-apply configuration fix.
Which compliance frameworks does this check evidence?
Findings from this check map to SCuBA, MCSB, NIST, SOC2, CIS, HIPAA, including SCuBA policy MS.AAD.4.1v1, and MCSB controls LT-1, LT-3. That mapping is what turns a scan finding into audit evidence.
Can I ask my own AI about this check?
Yes. This page includes a free copy-paste AI prompt carrying the check's facts: what it verifies, the risk, the remediation, and the framework mappings. Paste it into Claude, ChatGPT, or Copilot; cite-worthy detail without giving an AI access to your tenant.
All 672 checks with severities and mappings: the Microsoft 365 security checks catalog.