Why does my C# code fail to connect to a remote MySQL database via SSH, and how can I fix it?

Connecting to MySQL from .NET via SSH.NET Library

Building web applications that access remote MySQL databases over SSH connections requires the use of libraries like Renci.SshNet.dll and mysql-connector-net-6.9.7. This article explores how to overcome challenges in connecting to MySQL using these libraries.

Problem:

The provided C# code fails to retrieve data from the MySQL database on the remote server via an SSH connection.

Solution:

The issue lies in the incorrect use of Server and Port settings in the MySQL connection string. Here's the corrected version:

<code class="csharp">MySqlConnectionStringBuilder connBuilder = new MySqlConnectionStringBuilder();
connBuilder.AllowBatch = true;
connBuilder.Server = "portal.RemoteServer.edu";
**// Change the Port to 22 (SSH connection port)**
connBuilder.Port = 22;
connBuilder.UserID = "LocalHostUserID";
connBuilder.Password = "LocalHostPassword";
connBuilder.Database = "DatabaseName";

// SSH connection details
var auth = new PasswordAuthenticationMethod("RemoteServerUsername", "RemoteServerPassword");
ConnectionInfo conInfo = new ConnectionInfo("portal.RemoteServer.edu", "RemoteServerUsername", auth);

using (SshClient client = new SshClient(conInfo))
{
    // ... (rest of the code remains the same)
}</code>

By setting Server to the SSH connection address and changing the Port to 22, the connection is established over SSH, and subsequent database operations can succeed.

Additional Notes:

In the corrected code, a ForwardedPortLocal object is used for port forwarding between 3306 (MySQL port) on 127.0.0.1 and 127.0.0.1:22. This allows the local MySQL client to connect to the remote MySQL database via the SSH tunnel on port 22.

The provided solution assumes the MySQL server is listening on port 3306 on the remote host. If your MySQL server listens on a different port, be sure to adjust the code accordingly.

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