We have recently run into an issue with one of our child domains in our forest. Up until last week there was not an issue. Now when users from the child domain try to access any of our resources in the parent domain, it requests a login.
When they put in the following,
it will not allow them in. However when they put
It allows them to login.
This would not be as big of an issue except that we have now add window authentication to SQL for one of our applications.
When they try to login on machine that are connected to the Parent domain if they use pre-2000 login, it will not let them login. If they use their normal login, then they get a "password or user name incorrect" error.
We think this is an issue with something with NetBIOS. When we are in the child domain and try to connect to the ADUC of the parent, we can't type in "CORP", we have to search by Domain.net. We can however connect to any of the other child domains by NetBIOS name with no issue.
Replication looks like it is working properly from all domains, but I am not sure where else to look. This is only effecting one child domain. We have several others that are working correctly.