Explicit SSL uses the same port that regular FTP (21).<\/p>\n
After regular connection, client explicitly asks the server to secure the connection<\/strong>. “AUTH TLS” command is used to do that. You should use AuthTLS<\/em> method to enable TLS\/SSL for both data channel and control channel:<\/p>\n If your FTP server is using other port<\/strong> than standard 21, you need to use overloaded version of Connect<\/em><\/p>\n The last sample shows how to deal with self-signed certificates<\/strong>:<\/p>\n
\nAs the SSL\/TLS protocols self-negotiate their levels, there is no need to distinguish between SSL and TLS.<\/p>\n\r\n\/\/ C# version\r\n\r\nusing (Ftp client = new Ftp())\r\n{\r\n client.Connect("ftp.example.org");\r\n\r\n client.AuthTLS();\r\n\r\n client.Login("username", "password");\r\n\r\n foreach (FtpItem item in client.GetList())\r\n {\r\n if (item.IsFolder == true)\r\n Console.WriteLine("[{0}]", item.Name);\r\n else\r\n Console.WriteLine("{0}", item.Name);\r\n }\r\n client.Close();\r\n}\r\n<\/pre>\n\r\n' VB.NET version\r\n\r\nUsing client As New Ftp()\r\n\r\n client.Connect("ftp.example.org")\r\n\r\n client.AuthTLS()\r\n\r\n client.Login("username", "password")\r\n\r\n For Each item As FtpItem In client.GetList()\r\n If item.IsFolder = True Then\r\n Console.WriteLine("[{0}]", item.Name)\r\n Else\r\n Console.WriteLine("{0}", item.Name)\r\n End If\r\n Next\r\n client.Close()\r\nEnd Using\r\n\r\n<\/pre>\n\r\n\/\/ C# version\r\n\r\nclient.Connect("ftp.example.org", 999);\r\n<\/pre>\n\r\n' VB.NET version\r\n\r\nclient.Connect("ftp.example.org", 999)\r\n<\/pre>\n\r\n\/\/ C# version\r\n\r\nusing (Ftp client = new Ftp())\r\n{\r\n \/\/ Use this line to validate self-signed certificates:\r\n client.ServerCertificateValidate += ValidateCertificate;\r\n\r\n client.Connect("ftp.example.org");\r\n client.AuthTLS();\r\n client.Login("username", "password");\r\n\r\n foreach (FtpItem item in client.GetList())\r\n {\r\n if (item.IsFolder == true)\r\n Console.WriteLine("[{0}]", item.Name);\r\n else\r\n Console.WriteLine("{0}", item.Name);\r\n }\r\n client.Close();\r\n}\r\n\r\nprivate static void ValidateCertificate(\r\n object sender,\r\n ServerCertificateValidateEventArgs e)\r\n{\r\n const SslPolicyErrors ignoredErrors =\r\n SslPolicyErrors.RemoteCertificateChainErrors |\r\n SslPolicyErrors.RemoteCertificateNameMismatch;\r\n\r\n if ((e.SslPolicyErrors & ~ignoredErrors) == SslPolicyErrors.None)\r\n {\r\n e.IsValid = true;\r\n return;\r\n }\r\n e.IsValid = false;\r\n}\r\n<\/pre>\n\r\n' VB.NET version\r\n\r\nUsing client As New Ftp()\r\n ' Use this line to validate self-signed certificates:\r\n AddHandler client.ServerCertificateValidate, AddressOf ValidateCerificate\r\n\r\n client.Connect("ftp.example.org")\r\n client.AuthSSL()\r\n client.Login("username", "password")\r\n\r\n For Each item As FtpItem In client.GetList()\r\n If item.IsFolder = True Then\r\n Console.WriteLine("[{0}]", item.Name)\r\n Else\r\n Console.WriteLine("{0}", item.Name)\r\n End If\r\n Next\r\n client.Close()\r\nEnd Using\r\n\r\nPrivate Sub ValidateCerificate( _\r\n ByVal sender As Object, _\r\n ByVal e As ServerCertificateValidateEventArgs)\r\n\r\n Const ignoredErrors As SslPolicyErrors = _\r\n SslPolicyErrors.RemoteCertificateChainErrors Or _\r\n SslPolicyErrors.RemoteCertificateNameMismatch\r\n\r\n If (e.SslPolicyErrors And Not ignoredErrors) = SslPolicyErrors.None Then\r\n e.IsValid = True\r\n Return\r\n End If\r\n e.IsValid = False\r\nEnd Sub\r\n<\/pre>\n