Better error message for login of users from other realms
When user from other realm than FreeIPA's tries to use Web UI (login via forms-based auth or with valid trusted realm ticket), he gets an unauthorized error with X-Ipa-Rejection-Reason=denied. Web UI responds with showing login dialog with following error message: 'Sorry you
are not allowed to access this service.'.
Note: such users are not supported because they don't have a corresponding entry in LDAP which is needed for ACLs.
https://fedorahosted.org/freeipa/ticket/3252
denied change