A user account restriction (for example, a time-of-day restriction) is preventing you from logging on. For assistance, contact your system administrator or technical support.
projectblack.io | research | #active-directory | #kerberos | #windows-security | #rdp | #troubleshooting | #protected-users
Summary
Adding accounts to Active Directory's Protected Users group disables NTLM and can block RDP; Project Black shows the fix — use UPN (user@corp.local) with the server's FQDN — and other causes.
- Published
- Collected
--- id: 3711 title: "A user account restriction (for example, a time-of-day restriction) is preventing you from logging on. For assistance, contact your system administrator or technical support." source_domain: projectblack.io source_url: "https://projectblack.io/blog/a-user-account-restriction-is-preventing-you-from-logging-on/" published_at: "2026-06-27 07:39" tags: ["active-directory", "kerberos", "windows-security", "rdp", "troubleshooting", "protected-users"] phying_url: "https://phying.com/item/3711" lang: en --- # A user account restriction (for example, a time-of-day restriction) is preventing you from logging on. For assistance, contact your system administrator or technical support. ## Summary Adding accounts to Active Directory's Protected Users group disables NTLM and can block RDP; Project Black shows the fix — use UPN (user@corp.local) with the server's FQDN — and other causes. ## Intelligence Metadata - **Sources:** projectblack.io - **Published:** 2026-06-27 07:39 - **Original:** https://projectblack.io/blog/a-user-account-restriction-is-preventing-you-from-logging-on/ - **Phying News:** https://phying.com/item/3711