First you need ti get few details from your network team: > Whether these two domains are in trust mode to each other (or trust each other) > How are they integrated Security i.e. if they both are based over Active directory etc. then you need to ping both the server from cross domains meaning ping DomainB.ServerB from DomainA. ServerA and vice-verse and ensure you are getting response to your ping request from both sides. Once this is done successfully try adding the link server using FQDN (Fully Qualified Domain Name). Let me know if it doesn't works and I will be happy to help you.