Table 1. LDAP communication channels

Connection	Description	LDAP import support?	LDAP authentication support?
MID Server connection	Communicates over HTTP on port 80 by default. This communication channel does not require a certificate. The connection between the MID Server and the instance is over HTTPS (port 443). You can use the MID Server to import data over LDAP, but you cannot use the MID Server for LDAP authentication. Proceed to Define the LDAP Server.	Yes	No
Standard LDAP integration	Communicates over TCP on port 389 by default. This communication channel does not require a certificate. Proceed to Define the LDAP Server.	Yes	Yes
SSL-encrypted LDAP integration (LDAPS)	Communicates over TCP on port 636 by default, This communication channel requires a certificate. Proceed to Install the LDAP X.509 SSL certificate to obtain and upload the certificate.	Yes	Yes
VPN connection	Communicates over an IPSEC tunnel. Purchase or create an IPSEC tunnel on your local network. Proceed to Define the LDAP Server.	Yes	Yes

If using a MID Server, the MID Server connects to the instance and the MID Server also connects to the LDAP server. In both cases, the MID Server initiates the connection:

1. First, the MID Server connects to the LDAP server via LDAP on Port 389.
2. Then, the MID Server initiates an HTTPS encrypted connection to the instance on Port 443 to push the data to the instance.