Security Systems Error Code
Systems & Devices
Security Systems
0xC000015B | Logon type not granted
Industry
Systems & Devices
Canonical
/systems/security-systems/error-codes/0xc000015b/
Last Updated
Feb 27, 2026
Summary
The account is not allowed to log on using the requested logon type (e.g., RDP, service, network).
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What This Code Means
0xC000015B indicates a policy restriction that denies the requested logon type. For example, an account may be blocked from interactive logon, remote desktop logon, or “log on as a service” depending on local or domain policy.
Where Users Usually See This Code
- RDP login failures
- Service startup failures when the service account lacks “log on as a service”
Why This Code Appears
- User rights assignment policy does not permit that logon type
- Group policy changed
- Account moved to different group/OU
What Typically Happens Next
- Authentication fails until rights are granted appropriately
What This Code Is Not
- It is not always a wrong password
- It is not a network outage
Troubleshooting Checklist
- □ Identify the logon type (service, RDP, network) being attempted
- □ Review user rights assignment and group policy
- □ Grant the minimal required rights following your security policy
Notes And Edge Cases
Over-granting logon rights is a security risk; apply least privilege.
Related Codes
8 links
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