com.enterprisedt.net.puretls.SSLPrematureCloseException

Question

Hi,
I am using Edit FTP pro to connect to a vendor FTP site using Implicit FTPS. I am trying to put a file. I have verified that the file is getting to it's destination correctly, but I am getting the following error on the FTP client site

java.net.SocketTimeoutException: Read timed out
at java.net.SocketInputStream.read(SocketInputStream.java:140)
at java.net.SocketInputStream.read(SocketInputStream.java:193)
at java.io.FilterInputStream.read(FilterInputStream.java:77)
at java.io.PushbackInputStream.read(PushbackInputStream.java:133)
at com.enterprisedt.net.puretls.N.A(Unknown Source)
at com.enterprisedt.net.puretls.I.A(Unknown Source)
at com.enterprisedt.net.puretls.Y.A(Unknown Source)
at com.enterprisedt.net.puretls.r.read(Unknown Source)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:452)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:494)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:222)
at java.io.InputStreamReader.read(InputStreamReader.java:177)
at java.io.BufferedReader.fill(BufferedReader.java:147)
at java.io.BufferedReader.readLine(BufferedReader.java:310)
at java.io.BufferedReader.readLine(BufferedReader.java:373)
at com.enterprisedt.net.ftp.FTPControlSocket.E(Unknown Source)
at com.enterprisedt.net.ftp.FTPClient.validateTransfer(Unknown Source)
at com.enterprisedt.net.ftp.FTPClient.put(Unknown Source)
at com.enterprisedt.net.ftp.FTPClient.put(Unknown Source)
at com.enterprisedt.net.ftp.FTPClient.put(Unknown Source)
..................................................

After having gone through your forums I came across the SSLFTPClient.ConfigFlags.DISABLE_SSL_CLOSURE flag.
I have used that flag as suggested, but I was still getting same exception. So, I increased the timeout value as follows, to see if timeout is an issue.
ftp.setTimeout( 180000 );

Now I am getting the following exception.

com.enterprisedt.net.puretls.SSLPrematureCloseException: Short read
at com.enterprisedt.net.puretls.N.A(Unknown Source)
at com.enterprisedt.net.puretls.I.A(Unknown Source)
at com.enterprisedt.net.puretls.Y.A(Unknown Source)
at com.enterprisedt.net.puretls.r.read(Unknown Source)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:452)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:494)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:222)
at java.io.InputStreamReader.read(InputStreamReader.java:177)
at java.io.BufferedReader.fill(BufferedReader.java:147)
at java.io.BufferedReader.readLine(BufferedReader.java:310)
at java.io.BufferedReader.readLine(BufferedReader.java:373)
at com.enterprisedt.net.ftp.FTPControlSocket.E(Unknown Source)
at com.enterprisedt.net.ftp.FTPControlSocket.B(Unknown Source)
at com.enterprisedt.net.ftp.FTPControlSocket.<init>(Unknown Source)
at com.enterprisedt.net.ftp.ssl.SSLFTPControlSocket.<init>(Unknown Source)
at com.enterprisedt.net.ftp.ssl.SSLFTPClient.connect(Unknown Source)
...........................................

I really like Edit FTP pro for it's simplicity, documentation and that it is java based. So, I started using it. But we are very close to moving this into production and I really need some help with this or I may be forced to move on to a different FTP program.

Please let me know if you need any more logging informaiton and I will send it right away?

Thanks
Sowjanya

Answer 1

I have File Zilla Server software on my machine. I use it to test file transmissions on normal FTP port i.e. 21.
Is it easy to setup a Implicit SSL FTP server on my machine to test it out? I don't know if it worth the effort.

Thanks
Sowjanya

Answer 2

In your very first post, the blocked port was apparently not the issue, as the transfer succeeded but the control connection timed out waiting for the server response.

Answer 3

Any idea what the following exception messages from my original post mean or translate into?

Caused by: com.enterprisedt.net.puretls.SSLPrematureCloseException: Short read
at com.enterprisedt.net.puretls.N.A(Unknown Source)
at com.enterprisedt.net.puretls.I.A(Unknown Source)
at com.enterprisedt.net.puretls.Y.A(Unknown Source)
at com.enterprisedt.net.puretls.r.read(Unknown Source)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:452)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:494)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:222)
at java.io.InputStreamReader.read(InputStreamReader.java:177)
at java.io.BufferedReader.fill(BufferedReader.java:147)
at java.io.BufferedReader.readLine(BufferedReader.java:310)
at java.io.BufferedReader.readLine(BufferedReader.java:373)
at com.enterprisedt.net.ftp.FTPControlSocket.E(Unknown Source)
at com.enterprisedt.net.ftp.FTPControlSocket.B(Unknown Source)
at com.enterprisedt.net.ftp.FTPControlSocket.<init>(Unknown Source)
at com.enterprisedt.net.ftp.ssl.SSLFTPControlSocket.<init>(Unknown Source)
at com.enterprisedt.net.ftp.ssl.SSLFTPClient.connect(Unknown Source)


Thanks
Sowjanya

Answer 4

Using SSLFTPClient.ConfigFlags.DISABLE_SSL_CLOSURE flag should prevent this from occurring. But it appears you also have a problem with the data port.

Answer 5

I cannot check with my network admin regarding the data port issue until the next 7-8 hours.

But is the following syntax any better than just SSLFTPClient.ConfigFlags.DISABLE_SSL_CLOSURE. I came across it in another posting on this site.

ftp.setConfigFlags(SSLFTPClient.ConfigFlags.DISABLE_SSL_CLOSURE | SSLFTPClient.ConfigFlags.DISABLE_WAIT_ON_CLOSE);

Answer 6

This is probably a silly question but I will ask it anyway.
When I try to connect with FileZilla it asks me to accept the server certitificate. What is it's equivilent step when I am connecting using edit FTP Pro API ? I certainly don't have any references to certificates in my code.

Pretty much like the following

log.info("Creating FTP client");
ftp = new SSLFTPClient();
ftp.setImplicitFTPS(true);
ftp.setRemoteHost("app01.winitucom.com");
ftp.setValidateServer(false);
ftp.setConfigFlags(SSLFTPClient.ConfigFlags.DISABLE_SSL_CLOSURE);
log.info("Setting remote host");
try {
ftp.connect();
log.info("sending auth()");
ftp.auth(SSLFTPClient.PROT_PRIVATE);
log.info("Logging in..... ");
ftp.login("sip.intercity-nl.com","XXXXXXX");
log.info("Setting connect mode..... ");
ftp.setConnectMode(FTPConnectMode.PASV);

log.info("Setting transfer type..... ");
ftp.setType(FTPTransferType.BINARY);

Answer 7

Full explanation of flags in API reference:

http://www.enterprisedt.com/products/ed ... Flags.html

Calling ftp.setValidateServer(false) disables certificate checking. You can enable it and check the certificate, see

http://www.enterprisedt.com/products/ed ... parta.html