gnuTLS 3.0.20 - 'Fatal error: The TLS connection was non-properly terminated' against Cisco load balancers

Nikos Mavrogiannopoulos nmav at
Tue Jun 19 00:28:11 CEST 2012

On 06/18/2012 11:36 AM, Scott McGillivray wrote:

> gnutls-cli --priority
> Info on the command found at
> I wonder what has changed in gnutls and openssl in recent versions that
> prevents them from gratefully downgrading to a supported TLS version when
> connecting to these Cisco CSS units.

The downgrade occurs on the server side. In the case you describe most
probably it's a broken server.


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