The 0x904 error is almost always a licensing mismatch or cache corruption . Clearing the local license cache fixes it for most client-side cases. For servers, verify your CALs and licensing mode in Group Policy.
If the error started after a Windows 11 update, try these client-side adjustments: 0x904 rdp error
Use the Microsoft Remote Desktop app from the Microsoft Store, which often uses a different connection stack than the built-in mstsc.exe . 4. Adjust Security & Network Settings The 0x904 error is almost always a licensing
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