Seen on Windows 11 against a real Frame: mstsc warns about xrdp's own
certificate before xrdp's login box appears.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
A Windows user reported "RDP not working". Frame Control ran `mstsc /v:HOST`,
which offers the Windows account; the Frame's xrdp (TLS, no NLA) only accepts
steamos with the Developer Mode password. The app also said "Opened Remote
Desktop" without checking that anything answered on port 3389.
- open_rdp checks port 3389 first and explains how to turn xrdp on
- On Windows, launch mstsc with a .rdp file naming user steamos (CRLF)
- Every platform's message says to sign in as steamos with the Developer Mode password
- The server no longer logs a page closing mid-reply (WinError 10053 on
Windows) as a 500 with an error diagnostic
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
