Terminal Services supports low, medium, and high encryption:
Low Encryption - secures the user logon information and data sent TO the server, but NOT data sent FROM the server. If your network is secure, this level of encryption is ok.
Medium Encryption - is recommended for non-secure networks that can't run 128 bit encryption. It encrypts the data in both directions, and is the default encryption level. Version 4.x of the client uses a 40-bit key and version 5.x uses a 56-bit key.
High Encryption - uses a 128-bit key to encrypt the data in both directions. Use it in North America, if your network is NOT secure.
To change the encryption level:
1. Administrative Tools / Terminal Services Configuration.
2. Press Connections.
3. Double-click the connection you want to change.
4. Select the General tab.
5. In the Encryption level box, select the encryption level.
6. Press OK.
NOTE: The new encryption level will be used at the next client log on.
NOTE: If you have multiple adapters, each can run a different encryption level.