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Connection to external data source using windows authentication (NTLM)

I'm trying to connect to an external SQL server DB programmatically from a SharePoint WebPart. The problem is that I'm not able to authenticate to the DB although I gave access to application pool ...
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1answer
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Which identity is being used and authenticated while connection to SQL Server with Windows Authentication?

SQL Server Windows authentication uses application's process identity or thread identity to connect. So, for a solution deployed to a SharePoint farm which identity will be used to connect Current ...