I created an AD-LDS instance using the Administrative Tools Active Directory Lightweight Directory Services Setup Wizard.
I can connect to the instance with ldp.exe on localhost:389.
However, I can only Bind to the server using the Simple Bind option. This sends the password in plaintext.
All other options return an error of "Invalid Credentials".
How can I make a connection to AD-LDS to validate user/password credentials without sending it in plaintext?
You can configure SSL and do a bind over 3389. https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/cc731012(v=ws.10)