I'm using commons-net 2.2, Java 1.5, ProFTPD 1.3.3d, No, the server is
not publicly accessible, but I could send the config file.
My code:
FTPClient ftpClient = new FTPClient();
ftpClient = new FTPSClient("TLS");
// this throws an exception with TLSProtocol TLSv1
ftpClient.connect(host, port);
int reply = ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftpClient.disconnect();
log.error("The FTP Server did not return a positive
completion reply!");
throw new
FtpTransferException(ECCUtils.ERROR_FTP_CONNECTION);
}
boolean loginSuccessful = ftpClient.login(userName, password);
if (!loginSuccessful) {
log.error("Login to the FTP Server failed! The
credentials are not valid.");
throw new
FtpTransferException(ECCUtils.ERROR_FTP_LOGIN);
}
ftpClient.execPBSZ(0);
ftpClient.execPROT("P");
boolean success = ftpClient.storeFile(fileName, fis);
if (!success) {
// this is false if "NoSessionReuseRequired" is not set
}
On Tue, May 17, 2011 at 12:52, sebb <[email protected]> wrote:
> On 17 May 2011 10:39, Michael Voigt <[email protected]> wrote:
>> Hi all,
>>
>> I have a problem with the FTPClient connecting to a ProFTPD server.
>
> What versions of Net, Java, ProFTPD?
>
> Is the server publicly accessible?
>
>> If the server uses the configuration option "TLSProtocol TLSv1", I
>> cannot connect to it at all. I recieve the following error message:
>> - javax.net.ssl.SSLException: Unrecognized SSL message, plaintext connection
>
> What code are you using?
>
>> On the server side I see in the log:
>> unable to accept TLS connection: protocol error:
>> - (1) error:14094416:SSL routines:SSL3_READ_BYTES:sslv3 alert
>> certificate unknown
>> - TLS/TLS-C negotiation failed on control channel
>>
>> If the server uses the configuration option "TLSProtocol SSLv23", I
>> can connect to it but I cant transfer any files. In the server log I
>> see:
>> - starting TLS negotiation on data connection
>> - TLSv1/SSLv3 renegotiation accepted, using cipher RC4-MD5 (128 bits)
>> - client did not reuse SSL session, rejecting data connection (see
>> TLSOption NoSessionReuseRequired)
>> - unable to open data connection: TLS negotiation failed
>>
>> If I add the NoSessionReuseRequired parameter to the ProFTPD config
>> everything works fine.
>>
>>
>> Now my question is if it is generally possible to connect to a server
>> with "TLSProtocol TLSv1" or "TLSProtocol SSLv23" without the
>> "NoSessionReuseRequired" parameter? Could someone provide a piece of
>> example code for this?
>>
>>
>> Kind regards,
>> Michael
>>
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