We are currently using MS Active Directory 2008 R2 as CSS authentication engine. Security team will migration to AD2012, whether DCRUM still support that integration?
Logically there should not be any issue with the AD 2012 LDAP service with the non-SSL.
If the LDAP server is using SSL Connection then the certificate from the LDAP server should be supported by the Dynatrace.
You can do this exercise in your test environment before moving towards production.