Comment 1 for bug 1205484

I primarily use Remmia for remoting into Windows workstations and servers because I like its GUI for managing the numerous connection settings to all these various Windows machines.

However, sometimes Remmina won't connect to some servers or workstations. Oddly, when this occurs, I can successfully connect to the same machine (that Remmina can't connect to) using rdesktop:
sudo apt-get install rdesktop

With a command like this:
rdesktop 192.168.1.1 -a 16 -g 1370x850 -u UserName -d domain.local '-rdisk 'home'=/home/user/Share'

Why is rdesktop able to connect to some machines that Remmina can't?

Answer: [Remmina > Profile > Advanced > Security > Negotiate ] fails to negotiate the correct security (RDP).