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Cannot connect to Citrix ShareFile FTPS on Port 990

0 votes
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asked Sep 12 in .NET FTP by dsmith (120 points)

Hey all, I've managed to open an FTP connection to Citrix Sharefile on Port 21, but when I change to Port 990, it comes back with Control channel unexpectedly closed ('' read so far).

I'm new to this library, and all I've done is use the following code:

  'Open FTP connection
        Dim ftp As New EnterpriseDT.Net.Ftp.SecureFTPConnection
        EnterpriseDT.Util.Debug.Logger.CurrentLevel = EnterpriseDT.Util.Debug.Level.ALL
        ftp.ServerAddress = My.Settings.FtpServer
        ftp.ServerPort = 990
        ftp.UserName = My.Settings.FtpUser
        ftp.Password = My.Settings.FtpPassword

When changed to Port 21, this works perfectly.  I should also point out that using FileZilla to connect on Port 990 works fine. I'm hoping that I'm just missing a property or something - help please?!  

Here is what comes back when I attempt to open a connection on Port 990:

DEBUG [SSLFTPClient] 12 Sep 2017 16:18:16.667 :  Connecting to 54.206.19.242:990
DEBUG [SSLFTPControlSocket] 12 Sep 2017 16:18:16.668 :  waitOnShutdownSSL=True
DEBUG [SecureSocket] 12 Sep 2017 16:18:16.672 :  ChangeSecurityProtocol: None
DEBUG [ExFTPControlSocket] 12 Sep 2017 16:18:16.674 :  Created control-socket: SocksContext=, ProxySettings=NoProxy, RemoteHost=54.206.19.242, controlPort=990, timeout=120000
DEBUG [FTPControlSocket] 12 Sep 2017 16:18:16.675 :  StrictReturnCodes=False
DEBUG [HostNameResolver] 12 Sep 2017 16:18:16.677 :  Resolving 54.206.19.242
DEBUG [HostNameResolver] 12 Sep 2017 16:18:16.677 :  54.206.19.242 resolved to 54.206.19.242
DEBUG [ExFTPControlSocket] 12 Sep 2017 16:18:16.677 :  Connecting directly to ftp-server 54.206.19.242:990
INFO [SSLFTPSocket] 12 Sep 2017 16:18:16.677 :  Connecting to 54.206.19.242:990 with timeout 120000 ms
DEBUG [SSLFTPSocket] 12 Sep 2017 16:18:16.709 :  Successfully connected to 54.206.19.242:990
DEBUG [FTPControlSocket] 12 Sep 2017 16:18:16.709 :  Setting socket timeout=120000
DEBUG [FTPControlSocket] 12 Sep 2017 16:18:16.709 :  SetSocketTimeout: 120000
ALL [SecureSocket] 12 Sep 2017 16:18:16.710 :  SecureSocket timeout=120000
ALL [SecureSocket] 12 Sep 2017 16:18:16.710 :  SecureSocket timeout=120000
INFO [FTPControlSocket] 12 Sep 2017 16:18:16.711 :  Command encoding=System.Text.SBCSCodePageEncoding
ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.216 :  Control channel unexpectedly closed ('' read so far)
DEBUG [FTPTaskProcessor] 12 Sep 2017 16:18:27.232 :  Purging task queue
DEBUG [FTPConnection] 12 Sep 2017 16:18:27.233 :  Closing connection [instance=0,abrupt=False]
DEBUG [FTPFileFactory] 12 Sep 2017 16:18:27.234 :  Defaulting to Unix parsing
DEBUG [FTPControlSocket] 12 Sep 2017 16:18:27.235 :  ---> QUIT
ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.236 :  Control channel unexpectedly closed ('' read so far)
ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.245 :  Exception in SendCommand : EnterpriseDT.Net.Ftp.ControlChannelIOException: Control channel unexpectedly closed ('' read so far)
ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.245 :  ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.245 :     at EnterpriseDT.Net.Ftp.FTPControlSocket.GiBfBwJo1P()
ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.246 :  ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.245 :     at EnterpriseDT.Net.Ftp.FTPControlSocket.eZVYKSnem3L()
ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.246 :  ERROR [FTPControlSocket] 12 Sep 2017 16:18:27.245 :     at EnterpriseDT.Net.Ftp.FTPControlSocket.SendCommand(String command)
ERROR [FTPConnection] 12 Sep 2017 16:18:27.246 :  Command error : EnterpriseDT.Net.Ftp.ControlChannelIOException: Control channel unexpectedly closed ('' read so far)
ERROR [FTPConnection] 12 Sep 2017 16:18:27.246 :  ERROR [FTPConnection] 12 Sep 2017 16:18:27.246 :     at EnterpriseDT.Net.Ftp.FTPControlSocket.GiBfBwJo1P()
ERROR [FTPConnection] 12 Sep 2017 16:18:27.246 :  ERROR [FTPConnection] 12 Sep 2017 16:18:27.246 :     at EnterpriseDT.Net.Ftp.FTPControlSocket.eZVYKSnem3L()
ERROR [FTPConnection] 12 Sep 2017 16:18:27.246 :  ERROR [FTPConnection] 12 Sep 2017 16:18:27.246 :     at EnterpriseDT.Net.Ftp.FTPControlSocket.SendCommand(String command)
DEBUG [SecureSocket] 12 Sep 2017 16:18:27.254 :  Shutdown(Both)
WARN [FTPConnection] 12 Sep 2017 16:18:27.255 :  Caught exception closing connection: Control channel unexpectedly closed ('' read so far)

Thanks in advance.

2 Answers

0 votes
answered Sep 12 by Admin (2,230 points)
Please set the Protocol property to FTPSImplicit.
0 votes
answered Sep 12 by support2 (143,750 points)
Port 990 is the FTPS implicit mode port. You can't connect unless you set the protocol to FTPSImplicit.
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