"Because of security error, the client could not connect to the Terminal server. After making sure that you are logged on to the network, try connecting to the server again"

After trying to connect from a terminal i have been getting this error. I have tried a different terminal in it's place and seem to be able to log on with no issues at all. has anyone ever had this problem happen to them? if there is any other information you need to know i'll try and provide it. thanks