On Fri, Jul 11, 2014 at 08:38:00PM +0000, Alona Rossen wrote:
> Our C++ application uses libcurl 7.21.0 linked to openssl-1.0.0m to implement a
> variety of functionalities, including SMTP mail transfer.
>
> The application runs on numerous platforms of different versions, including
> Windows, Solaris 10/11 SPARC, Solaris 10/11 Intel, AIX6.1/7.1, different
> flavors and versions of Linux.
>
> We set up a test scenario in which we send an email using the same email server
> and account, utilizing TLSv1, SSLv2, SSLv3 protocols.
>
> The scenario successfully sends an email via any SSL protocol from any client
> platform, with the exception of Solaris 10 SPARC, where TLSv1 and SSLv2 fail
> with the following error message:
[...]
> INFO_TEXT:
> Unknown SSL protocol error in connection to our-server.com:<port>

Have you tried with the latest version of libcurl? There have been lots of SSL
fixes and even more mail fixes in the 4 years since 7.21.0 was released. Have
you read https://github.com/bagder/curl/blob/master/docs/SSL-PROBLEMS ?

>>> Dan
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Received on 2014-07-12