Hi,

First off all thanks for the hard work on this excellent project!
When I try to connect using the ftpclient I get the following error:

Org.Mentalis.Security.SecurityException: An error occurs while communicating wit
h the remote host. ---> Org.Mentalis.Security.Ssl.Shared.SslException: The serve
r hello message uses a protocol that was not recognized.
at Org.Mentalis.Security.Ssl.Shared.CompatibilityLayer.ProcessServerHello(Byt
e[] bytes, Int32 offset, Int32 size)
at Org.Mentalis.Security.Ssl.Shared.CompatibilityLayer.ProcessHello(Byte[] by
tes, Int32 offset, Int32 size)
at Org.Mentalis.Security.Ssl.Shared.SocketController.OnReceive(IAsyncResult a
r)
--- End of inner exception stack trace ---
at Org.Mentalis.Security.Ssl.SecureSocket.EndSend(IAsyncResult asyncResult)
at Org.Mentalis.Security.Ssl.SecureSocket.Send(Byte[] buffer, Int32 offset, I
nt32 size, SocketFlags socketFlags)
at FtpClient.SendCommand(String command) in c:\programming\seclib-1.0\samples
\ssl\ftpclient\ftpclient.cs:line 138
at FtpClient.DownloadFile(Url url, Int32 choice) in c:\programming\seclib-1.0
\samples\ssl\ftpclient\ftpclient.cs:line 106
at FtpClient.Start() in c:\programming\seclib-1.0\samples\ssl\ftpclient\ftpcl
ient.cs:line 91
at FtpClient.Main(String[] args) in c:\programming\seclib-1.0\samples\ssl\ftp
client\ftpclient.cs:line 48

I am using the example ftpclient from the sample directory. Other ftp clients supporting TLS/SSL are able to connect to the same server. Anybody has an idea what's causing this error? Thanks in advance.

This error occurs when the server the client is connecting to isn't using the SSL3 or TLS1 protocol. Most likely, the FTP server is still in plaintext mode.