Hi
A domain trust is a useful way to allow users from a trusted relationship domain to access services in a trusting domain, so the domain the SQL Server is in, trusts the domain that the requesting user is defined in. SQL Server will authenticate Windows credentials with it's domain controller. For cross domain authentication, domain controller controller should be able to authenticate credentials from both domains. This is accomplished through domain trusts
Best Regards
XiaoYong Dai
Microsoft Online Community Support
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