---
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