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From sebb <seb...@gmail.com>
Subject Re: [Net] problem connecting to ProFTP with FTPES
Date Tue, 17 May 2011 10:52:50 GMT
On 17 May 2011 10:39, Michael Voigt <michael.voigt@web.de> 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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