ipa-kdb did not reinitialize trusted domain configuration when it was loaded to ipa-kdb. However, admin then would have to restart krb5kdc if he wanted to apply the change to running krb5kdc service. Run ipadb_reinit_mspac unconditionally every time when trusted domain is loaded. Among the already configured 1 minute grace time, also add a quick check if there is at least one configured trusted domain before reinitializing the mspac structure. https://fedorahosted.org/freeipa/ticket/3289