Have two forests trusted on a two way trust. My issue is when users try to authenticate to the server in the remote forest they get a message that they don't have authentication permission.
I have used ADUC and added the domain users group of the remote forest to the server and enabled the authentication permission. Afterwards, users can connect to the remote server for a short time. Within a few hours the problem repeats. Then if I check the server permissions, the remote forest group is no longer listed.
Why is it disappearing? How do I stop this from disappearing?
Also the remote server is running Windows Server 2012 R2. The local network is running Windows 2008 R2 as the servers architecture.