Start by checking the Windows update history on the remote machine. If it hasn’t been updated since 2018, that’s your culprit. If you are unable to update it, use the Group Policy or Registry method to temporarily set the encryption oracle to "Vulnerable."
The error should disappear immediately. If it persists, move to Fix #2. rdp error code 0x3 extended error code 0x7
The RDP error code 0x3 and extended error code 0x7 typically occur when a user attempts to establish a remote desktop connection to a Windows machine. The error message may appear as: Start by checking the Windows update history on
Navigate to Computer Configuration > Administrative Templates > System > Device Installation > Device Installation Restrictions . Ensure "Prevent installation of removable devices" is set to Not Configured . If it persists, move to Fix #2
Log entries and what to read for meaning
Check network reachability