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[Help-gnutls] Re: client hello refused

From: kyle cronan
Subject: [Help-gnutls] Re: client hello refused
Date: Wed, 21 Feb 2007 23:23:20 -0800

It works with --comp NULL.  I hadn't tried that one by itself, since I
didn't think the server would punish me just for offering.  Hopefully
someone will find this helpful some day!


On 2/21/07, kyle cronan <address@hidden> wrote:

My question is about how to debug the situation where the TLS server
closes the connection right after the client hello message is sent
(gnutls 1.4.5).  I didn't have much luck searching the list archives
for hello!

Looking at what's in an SSL/TLS hello, perhaps cipher_suites,
compression_methods and client_version are candidates for causing
trouble?  I believe I tried all the different client versions using
--protocols, and I see from gnutls_handshake.c that the extensions are
only sent if we're using a TLS version, not SSL3.  So it shouldn't be
a protocol extension that's causing the problem either.  That just
leaves ciphers and compression methods.  But wouldn't I get an error
like "could not negotiate a supported cipher suite"?  Have servers
been known to just close the connection without giving a handshake

Unfortunately the server software is some unknown black box type
stuff.  It does work with openssl s_client though (0.9.7a), even when
I select various single ciphers with the -cipher option.

Kyle Cronan

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