encrypted connection between clients and server

[haniis]

I have windows server 2008 as a domain controller so how to enforce the communication between the clients and server to be encrypted. so some of my clients could steal the passwords for some clients .

The clients are not joined to domain . the only use the accounts to connect to internet as domain\account.

[AWS]

Encryption should be set by default. I know when I connect to my server it lets me know the connection is secure.

[haniis]

no the connection is not secure