Too Many Redirects error shown on mapped-domain.com/wp-admin page. By itself the mpped-domain.com it is loading. Domain Mapping settings are set to "domain entered by the user" for Administration and for Login Mapping. When Login Mapping is set to original domain, the error goes away, but it loads sub.originaldomain.com/wp-admin which is not preferable URL.
This happens only one mapped domain.
Please advise how to fix Too Many Redirects error on mapped-domain.com/wp-admin page?