my-skills

Diagnose and fix Windows Remote Desktop (RDP) login or connection failures, especially over Tailscale/VPN and especially for PCs signed in with a Microsoft account. Use this WHENEVER the user reports RDP trouble on Windows — "RDP 로그인이 안 돼요" / "remote desktop credentials rejected" / "자격 증명이 작동하지 않습니다" / "can't connect to my PC over Tailscale" / "Windows Hello only sign-in blocks remote login" / PIN-vs-password confusion / NLA failures / "remote desktop keeps disconnecting after a few seconds". Covers the read-only diagnostic sweep (RDP enabled, TermService, port 3389, firewall incl. localized rule names, NLA, account type/admin/lockout, Tailscale), the crucial "can't connect vs credentials rejected" fork, Microsoft-account gotchas (DevicePasswordLessBuildVersion / Windows-Hello-only toggle needing a reboot, username format, passwordless accounts, stale cached password), event-log forensics, and account-lockout confounders. Trigger even if the user doesn't say the word "RDP" but clearly can't remote into a Wind