The wiki has a page https://wiki.samba.org/index.php/Configuring_LDAP_over_SSL_(LDAPS)_on_a_Samba_AD_DC that discusses LDAPS but I am going to assume this only applies if using Samba as a domain controller? I also see there is a setting for "tls enabled" in the smb.conf file as well along with some other settings for configuring TLS. Can/should any of these be used when using "security ads"? As I understand it "security = ads" uses Kerberos so I am inclined to say "no". But when I noticed the setting for "winbind rpc only" says LDAP is used first this makes me wonder if I might be using unsecure LDAP in some scenario.