What type of SQL are you connecting to? (Azure SQL Database, SQL Server on-premises, or SQL Managed Instance)
Which authentication method are you using? (SQL Server authentication, Microsoft Entra / Azure AD, or Windows authentication)
If it's on-premises, do you have the On-premises Data Gateway installed, running, and selected in the connection?
Can you share the exact error message you get when the test fails? That usually points straight to the root cause (firewall, credentials, gateway, or server name format).
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