I have the following C# code snippet to connect to the FTP server
public static async Task<FtpWebResponse> CreateFtpConnection(string uri, string userId, string password)
{
try
{
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
request.Method = WebRequestMethods.Ftp.ListDirectory;
request.Credentials = new NetworkCredential(userId, password);
var response = (FtpWebResponse)request.GetResponse();
return await Task.FromResult(response);
}
catch (Exception ex)
{
throw ex;
}
}
While executing the code, I got (421) Service not available, closing control connection error as shown below.
Reason and Fix:
- In my case SSL was configured on FTP.
- By setting the EnableSsl property to the FtpWebRequest object solved the issue:
request.EnableSsl = true;
Here is the modified code snippet:
public static async Task<FtpWebResponse> CreateFtpConnection(string uri, string userId, string password)
{
try
{
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
request.Method = WebRequestMethods.Ftp.ListDirectory;
request.Credentials = new NetworkCredential(userId, password);
request.EnableSsl = true;
var response = (FtpWebResponse)request.GetResponse();
return await Task.FromResult(response);
}
catch (Exception ex)
{
throw ex;
}
}
🙂
![[Step by Step] Beginner : Create a PCF control and add it to a custom page](https://rajeevpentyala.com/wp-content/uploads/2024/12/image-49.png)
![[Step by Step] Configure and run 'Pipelines in Power Platform'](https://rajeevpentyala.com/wp-content/uploads/2024/08/image.png)
Rajeev Pentyala – Technical Blog on Power Platform, Azure and AI 
Leave a comment