Silk Central LDAP integration supports plain-text authentication and SSL authentication.
Your directory service must either allow anonymous queries or a user with read rights on the directory must be provided.
This means that within the BindDN field, it is optional only if you use "Anonymous Queries".
If not, you must have a user account with read rights, that preferably has a permanent password.
If the password of the BindDN account changes, the verification will no longer be valid.
To setup an LDAP Server:
Further help can be found at the following help video.
The tool below can be used to return LDAP information.