On 2014-03-03, Tony Finch <[email protected]> wrote:
> I have receved a number of reports recently of TLS interop probblems
> between Exim+OpenSSL and Exim+GnuTLS. Is anyone else seeing anything
> similar?

McAfee email firewall appliances also hate gnutls.  But retrying delivery
(sometimes more than 20 times) is sufficient to get success.

> GnuTLS clients connecting to send mail see something like:
>
> 2014-02-27 15:50:14 1WJ2vo-0004Gf-4W
>       TLS error on connection to ppsw.cam.ac.uk [131.111.8.137] (recv):
>       A TLS fatal alert has been received.: Bad record MAC

Coming from the gnutls side that's what I'm seeing.

> There are some suggestions online that this might be related to GnuTLS's
> random record padding, but I thought the problems with that had been
> fixed.

I am no wiser.  Except that retrying always works if done enough. This 
points towards something variable.


-- 
Neither the pheasant plucker, nor the pheasant plucker's son.


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