具有自签名的C＃连接mysql

Question

Is self signed certificate disrupting connection to mysql? I already give action crud in data and grant access to administration.

but the connection still got error.

Unable to connect to any of the specified MySQL hosts

my team connection like this:

Catalog=devbaf;User Id=userclient;password=client123

connection code:

  try
        {
            string constring = "SERVER=123.45.678.9;DATABASE=devbaf;User Id=backendsystem;PASSWORD=1q2w3e4r5t;";
            using (MySqlConnection con = new MySqlConnection(constring))
            {
                using (MySqlCommand cmd = new MySqlCommand("SELECT * FROM users"))
                {
                    using (MySqlDataAdapter sda = new MySqlDataAdapter())
                    {
                        cmd.Connection = con;
                        sda.SelectCommand = cmd;
                        using (DataTable dt = new DataTable())
                        {
                            sda.Fill(dt);
                            gvtest.DataSource = dt;
                            gvtest.DataBind();
                        }
                    }
                }
            }
        }
        catch (Exception e)
        {
            Response.Write(e.Message.ToString());
        }

explanation problem:

I make a database in local server, so my friend can access to it to insert data. but when he make a connection script it wont connect to my database but can connect to server. He already tries to move some file to the server and it works,but the connection to database wont connect. i don't have an experience for this coz im php programmer not c# programmer. hope my explanation is clear.

Answer 1

I have found your error message like trying to connect the host but in your connection string is missing the MySQL server name or host address. I hope if you add the MySQL hostname or server address to your connection. it will fix your issue.

you can try this

string connectionString ="SERVER=servername; DATABASE=databasename; User Id=userid; PASSWORD=password;";