We have created a new child domain under the same forest.
Eg: Root domain = Costoso.com Child Domain = child.local
Exchange and SharePoint getting weird authentication errors when using AD users from the new domain.
For example, adding child.local user to a Site Collection ACL was successful but we got authentication error as follow:
No Authority could be contacted for authentication
Looks like the DC in parent domain do have have authority to authenticate users from Child domain.
Any idea?