Sql connection string via SqlClient

I have an issue trying to manually connect to a sql server on my network.

I have a web API with a conn string that works fine, I have a VS2015 winforms project i set up to test the conn using the VS tool to connect, this also works fine.

However when i try to connect via SQLconnection it fails and says the server cannot be found or isnt accessable.

So heres the test code...

string connectionString = @"Data Source=test1\test1;Initial Catalog=my_test;Integrated Security=True;";

        using (SqlConnection connection =
        new SqlConnection(connectionString))
        {
            // Create the Command and Parameter objects.
            SqlCommand command = new SqlCommand("", connection);
            // Open the connection in a try/catch block. 
            // Create and execute the DataReader, writing the result
            // set to the console window.
            try
            {
                connection.Open();
                SqlDataReader reader = command.ExecuteReader();
                while (reader.Read())
                {
                    Console.WriteLine("\t{0}\t{1}\t{2}",
                        reader[0], reader[1], reader[2]);
                }
                reader.Close();
            }

            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
            Console.ReadLine();
        }

Now i dont really care about results or anything i simply need to establish a connection. I cant figure out why it throws this error, when my Web API works and the VS tool for connection to DBs works fine too.

I have checked the server and enabled named pipes too just to make sure.

Any ideas?

EDIT:The error i catch...

 {"A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"}

happens after about 15 seconds trying to open the connection. The thing is this connectiin string i tried is the exact same string used via the SQL tool, I did this so i knew i had a valid string.

ODBC connection also falls over with the same message.

I checked from my machinbe is i can listen to port 1433 but it says the server isnt listening. However looking at the server its set to dynamic ports with a range of any to 41934, so im at a loss as to why it says its not listening evenb though its to dynamic ports

EDIT2: Well, must be permissions or drivers... just tried the exact same code and worked instantly...

This is diving into the realm of the unknown i feel. might ask for deletion of the question if no solution is found