unable to connect to any of the specified mysql hosts. c#

问题:

I've found many suggestions to fix this unprocessed exception, and I have tried every one I could find (and understand). It's been hours, but still no results... I've created a windows forms application that asks for a client's information and I'm trying to Insert this info into a DB I have created in MySQL. This is the code that seems to be working for everyone but me:

public partial class Form1 : Form {      private MySqlConnection mConn;     public Form1()     {         InitializeComponent();         mConn = new MySqlConnection("Persist Security Info=False; server=localhost; database=xxxxxxx;uid=yyyyyyy;password=zzzzzzzz");     }      private void button1_Click(object sender, EventArgs e)     {         mConn.Open();         if (mConn.State == ConnectionState.Open)         {             MySqlCommand command = new MySqlCommand("INSERT INTO client VALUES (" + textBox1.Text + ",' " + textBox2.Text + "', '" + textBox3.Text + "'," + textBox4.Text + ",' " + textBox5.Text + "')", mConn);             command.ExecuteNonQuery();             mConn.Close();         }         else             MessageBox.Show("Connection Failed!");     } } 

This is the exception text:

MySql.Data.MySqlClient.MySqlException (0x80004005): Unable to connect to any of the specified MySQL hosts. ---> System.Net.Sockets.SocketException (0x80004005): The requested adress is not valid in this context [::1]:3306 in ...

If you can help me I'll be very grateful. It's my first year programming and so far it has passed quite well, but now I have been "left behind" in my class because of this recurring error. Thank you in advance :)

回答1:

My Professor was able to find the problem. For some reason my computer can't recognize the term localhost as the IP address 127.0.0.1, so when I was writing server = localhost in the connection string, an error occurred. When I tried writing server = 127.0.0.1 everything worked smoothly. I hope this is helpful.

Working connection string:

"Persist Security Info=False;server=127.0.0.1;database=xx;uid=yy;password=zz" 

回答2:

The Problem with establishing connection to the remote site will be solved by providing public ip of that db instead of private one.

it will help u. Try it.

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