Has anyone successfully used the .Net FTPWebRequest class to ftps to a remote server from behind a NAT? My code is as follows:
Dim URI = "ftp://" & sRemoteDir & "/"
Dim ftp As FtpWebRequest = Nothing
Try
ServicePointManager.ServerCertificateValidationCallback = AddressOf ValidateServerCertificate
ftp = CType(FtpWebRequest.Create(URI), FtpWebRequest)
ftp.CachePolicy = New System.Net.Cache.RequestCachePolicy(System.Net.Cache.RequestCacheLevel.NoCacheNoStore)
ftp.Credentials = New NetworkCredential(sUID, sPw)
ftp.EnableSsl = True
ftp.Method = WebRequestMethods.Ftp.ListDirectoryDetails
Dim response As FtpWebResponse = CType(ftp.GetResponse(), FtpWebResponse)
Dim responseStream As Stream = response.GetResponseStream
Dim streamReader As New StreamReader(responseStream)
Dim sb As New StringBuilder()
sb.Append(streamReader.ReadToEnd)
streamReader.Close()
response.Close()
Return sb.ToString()
Catch ex As Exception
Return (ex.Message)
End Try
And I get the following exception:
"Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond."
I know the code is good, as it works if the machine is not behind a NAT. Any ideas? The machine has a static IP and all ports are open for traffic to/from the specified host.