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This doesn't appear to be a Tableau issue. This actually seems to be an issue connecting to the SQL Server. In my experience, this is usually due to some sort of firewall that is blocking connectivity. My suggestion would be to try to connect to the SQL Server via SQL Server Management Studio to see if that works. Then come back and let us know if you were able to connect that way. That will help us to determine where to go from here.
I agree with Ken. I believe this is not an issue with Tableau but the SQL Server itself. Were you able to test the connection as Ken mentioned?