OpenConnect-GUI: A record packet with illegal version was received.

Nikos Mavrogiannopoulos nmav at
Fri Nov 7 07:08:54 PST 2014

On Fri, Nov 7, 2014 at 1:57 PM, Niels Peen <niels at> wrote:

>> The cases that this can happen is when there are no commonly supported
>> protocols, or the peer doesn't correctly set the TLS record versions.
>> That's almost impossible to occur between two gnutls peers. Could that
>> again be related to a firewall that modifies the packets sent/received?
> Possible. The user turned off their firewall (ESET), but I'm not convinced
> that turning it off completely restores normal behaviour.

You mean he still cannot connect even after turning it off? If he gets
the same error, could he be in a corporate firewall that tries to
perform man-in-the-middle? Having a wireshark transcript of his
sessions would help identify the issue.


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