Hi,
We have a setup where our domain has a one way external trust with another. We have recently migrated all servers from 2008R2 to 2016 and we are seeing an issue on one server when trying to add objects (in this example its user accounts to NTFS ACL) from the remote domain on the one affected server.
I have set the old server IP on the affected server and everything works, I select the remote domain, type in a username and click check names, it returns a username/password prompt, which is expected. When this IP is set, I see network traffic on port 389 only to the DC in our domain. When the new IP is set, I select the remote domain, put in the user ID click check name and after a while it returns "name not found", at the same time I see a lot of connections on 389 to the domain controllers on the remote domain.
I am told by the network team that all rules for the old IP and new IP match, but I am not 100% sure on how traffic flows and on which ports in this situation to get them to be able to check for me.
Looking for some information on how I can troubleshoot this or if anyone has any ideas what might be the issue.
Thanks