Server does not detect different server and IPA domain
Server installer does not properly recognize a situation when server
fqdn is not in a subdomain of the IPA domain, but shares the same
suffix.
For example, if server FQDN is ipa-idm.example.com and domain
is idm.example.com, server's FQDN is not in the main domain, but
installer does not recognize that. proper Kerberos realm-domain
mapping is not created in this case and server does not work
(httpd reports gssapi errors).
https://fedorahosted.org/freeipa/ticket/4012