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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/freeipa/ticket/3364

A user reported difficulties in migrating from an SSL-secured server and it took a bit of time to work out the details.

I found a way that works, we should probably put this into the migration docs.

IPA uses the openldap client libraries to connect to the remote LDAP server. It does this within the context of Apache on the IPA server.

You need to provide a location of the CA certificate(s) to the openldap library. There are several options, all of which involve editing /etc/openldap/ldap.conf:

1. Comment out TLS_CACERT and add a new one pointing to the PEM file for the CA of the remote LDAP server
2. Add the remote LDAP CA file to an NSS database and point to that database with TLS_CACERTDIR
3. Add the remote LDAP CA file to a directory and point to that directory with TLS_CACERTDIR

In all cases the httpd service needs to be restarted after making the change.

Then you run ipa migrate-ds.

Also you'll want to reverse whatever changes made to ldap.conf after the migration. Mostly just because it isn't really needed any more, and depending on what you change you could cause future weird problems (like not trusting the IPA CA).

Changing the product to RHEL 7.

Recommend putting the remote LDAP CA certificate into /etc/ipa/remote.crt. 

Be sure to run restorecon /etc/ipa/remote.crt. Label should be unconfined_u:object_r:etc_t:s0

Verified.