Sonicwall stopping RDP connection with Encrypted Key Exchange signature

Hi everyone,

Everytime I try to connect to a Windows Server 2016, I am dropped by the firewall with Encrypted Key Exchange signature(7). 

The map problem is as follows: I start a connection, type my user and pass(successfull) and then, when the windows screen would appear, its blocked and after some seconds, it shows an error "internal error" and the RDP screen closes. 

The problem occurs only in windows Server 2016. Others server using Windows Server 2012, the problem does not occurs. 

Any help, it would be very appreciated.

Fernando Dias