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Error: The account written in the RDP user name does not have RDP authorization. RDP authorization must be turned on.
Solution:Control panel> Control panel > system and security >system >remote settings buradan from here allow remote connection to this computer bunu ve altında yer alan and under network level authentication.
Other Option: Open Group Policy açılarak and check Local Policies > user right assignment buradanassignment from allow log on truht remote desktop service kontrol edilmelidir. Bağlanılacak kişiler buradan seçilir. The people to be connected are selected here.