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thanks for you comment, issue sorted
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Have the following issue<br />
<br />
User trying to establish “Link Server” connection. It &nbsp;fails.<br />
<br />
Running select auth_scheme from sys.dm_exec_connections where session_id=@@spid returns NTLM<br />
<br />
If SPN is registered for SQL service in AD assume issue is NTLM<br />
<br />
What remedial action is required to make connection work?
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Have the following issue

User trying to establish “Link Server” connection. It  fails.

Running select auth_scheme from sys.dm_exec_connections where session_id=@@spid returns NTLM

If SPN is registered for SQL service in AD assume issue is NTLM

What remedial action is required to make connection work?

SQL Linked Server Issue

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.

Active Directory

Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.