I--- Remote Desktop Connection Error Code 0x904 Free

(All editions):

The 0x904 error typically fires when the demands a high-security level (e.g., CredSSP v6 or higher), but the RDP server only supports an older, deprecated version—or vice versa. The negotiation fails, and Windows deliberately throws error 0x904 to prevent a security downgrade attack (a man-in-the-middle forcing both sides to use weak encryption). i--- Remote Desktop Connection Error Code 0x904

It is easy to confuse authentication RDP codes. Here is a quick reference: (All editions): The 0x904 error typically fires when

dism /online /cleanup-image /restorehealth sfc /scannow CredSSP v6 or higher)

0x904 Source: Microsoft Remote Desktop (RDP) Client Affected Platforms: Windows (All versions), macOS, iOS, Android