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AuthorForum: PowerTCP FTP for .NET
Topic: FTPS and EncryptData=False
steinot2

From: Norway
Posts: 4
Member Since: 07/20/15
posted February 20, 2020 8:43 AM

I'm having a problem with transferring files to ftp-site with FTPS, ConnectType.Passive, EncryptControl.Implicit and EncryptData=True

When a file is transferred using the .Put-function the error is : "Authentication failed because the remote party has closed the transport stream.". The file is actually created on the ftp-server, but is empty.

When I change EncryptData=False then it is working as it should. Why does setting .EncryptData to True cause this error?
Nick B (Admin)

From: Utica, NY USA
Posts: 614
Member Since: 05/25/10

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Custom Application Development

posted February 20, 2020 11:03 AM

Hello,

FTP uses two connections/channels - one for commands, and one for actually transferring the data. You'd need to contact the server's admin for more information (regarding configuration, or perhaps examining their logs), but I would assume that the server isn't configured for data channel encryption. The file is created via a command over the command channel, but actually uploading data to it fails due to the authentication failure.
steinot2

From: Norway
Posts: 4
Member Since: 07/20/15
posted September 23, 2020 7:20 AM

I got this one working setting .EncryptData=False, but now the ftp-server has been updated/changed and i'm getting the following:

Command=PBSZ 0 Code=200 Text=PBSZ=0
Command=PROT C Code=534 Text=This server requires an encrypted data connection with PROT P


So, I've changed .EncryptData=True

It now connects and authenticates, but .Put fails with
System.IO.IOException
"Authentication failed because the remote party has closed the transport stream."

StackTrace:  at Dart.Ftp.Ftp.(Command , String& , Int64 , FileType )
  at Dart.Ftp.Ftp.(String& , Int64 , StoreType )
  at Dart.Ftp.Ftp.(Stream , String , Int64 , StoreType , Int32 , Int32 , Int64& , Int64 )
  at Dart.Ftp.Ftp.(FileInfo , String , Synchronize , Int32 , Int32 , Int64& , Int64 )
  at Dart.Ftp.Ftp.Put(String localPath, String remotePath, Synchronize sync)
Jamie Powell (Admin)

From: Rome, NY USA
Posts: 436
Member Since: 03/13/07

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Custom Application Development

posted September 30, 2020 4:18 PM

What version are you using?

Please send a log file (such as one from the included FTP ListView Client sample) into support@dart.com.

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steinot2

From: Norway
Posts: 4
Member Since: 07/20/15
posted October 8, 2020 10:51 AM

v 4.7.7

FEAT
211-Features:
 MDTM
 REST STREAM
 SIZE
 MLST type*;size*;modify*;
 MLSD
 AUTH SSL
 AUTH TLS
 PROT
 PBSZ
 UTF8
 CLNT
 MFMT
 EPSV
 EPRT
211 End
OPTS UTF8 ON
202 UTF8 mode is always enabled. No need to send this command.
PBSZ 0
200 PBSZ=0
PROT P
200 Protection level set to P
USER HumanEF
331 Password required for xxxx
PASS xxxx
230 Logged on
PWD
257 "/" is current directory.
PASV
227 Entering Passive Mode (xxxxxxxx)
LIST
150 Opening data channel for directory listing of "/"


Exception: Authentication failed because the remote party has closed the transport stream.
Jamie Powell (Admin)

From: Rome, NY USA
Posts: 436
Member Since: 03/13/07

Extra Support Options
Custom Application Development

posted October 15, 2020 10:33 AM

An issue like this is almost always resolved by setting Ftp.Session.ConnectType to DataConnectType.PassiveOverrideAddress. However, it does seem odd to me that this would have worked previously, unless the server software was changed? If you continue to have an issue after changing that property, I'd suggest you try contacting the server administrator for additional assistance.

All the best,
Jamie

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-Non-current subscribers must contact sales@dart.com to update subscription and receive continued support as needed.
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