[user@hostname ~]$ xfreerdp -d DOMAIN -u USER 192.168.100.100
connected to 192.168.100.100:3389
Password:
SSL_read: Failure in SSL library (protocol error?)
Authentication failure, check credentials.
If credentials are valid, the NTLMSSP implementation may be to blame.
Достаточно запустить xfreerdp с ключем --sec rdp
[user@hostname ~]$ xfreerdp -d DOMAIN -u USER --sec rdp 192.168.100.100
connected to 192.168.100.100:3389
...