sssd Cross realm windows authentication fails with the ERROR : "Port status of port 0 for server 'AD.example.com' is 'not working'"

Issue

sssd 6.6 Cross realm windows authentication fails with the ERROR : "Port status of port 0 for server 'AD.example.com' is 'not working'"

Customer has a AD trusted Domain setup (same forest) in their production environment.
For instance will assume they are example redhat.com and trusted.com.
Currently they are able to ssh in a user in redhat.com domain.
But they are not able to ssh in as a user in trusted.com but id command returns uid/gid from trusted.com

failed ssh login attempts generates following sssd debug logs :

[get_server_status] (0x1000): Status of server 'ad.example.com' is 'name resolved'
[get_port_status] (0x1000): Port status of port 0 for server 'ad.example.com' is 'not working'