Because I have 2 LDAP servers listed (depicted above in previous post), it wants the one with the top priority (lowest number). If both have a priority of 50, the request goes to the first LDAP server in the list. The #ajax.args.server = LDAP SERVER has no bearing on anything.
If I change the Remote Site LDAP server to 49, the Corporate side (and Remote Site side) will use that entry. It doesn't matter that the #ajax.args.server = Corporate LDAP. With this type of logic built in, having 2 LDAP servers to accommodate 2 different Guest Self-Registrations is impossible.