'Incorrect Message Authentication Code' Error

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'Incorrect Message Authentication Code' Error
\ Julian Lamberty (29 Mar 2008)
. \ Melchert Fruitema (29 Mar 2008)
. \ squaredancer (29 Mar 2008)
. . \ Julian Lamberty (30 Mar 2008)
. \ Ron Hunter (30 Mar 2008)
. . \ David Pyles (30 Mar 2008)

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Subject:	'Incorrect Message Authentication Code' Error
Group:	Mozilla-support-firefox
From:	Julian Lamberty
Date:	29 Mar 2008

Hi!

Everytime I login at the german Vodafone (https secured) page I get an
error saying that www.vodafone.de has received a Message with "incorrect
message authentication code" and i should "contact the website
administrator".

I'm using Firefox 2.0.0.13 on Windows XP Professional SP2: (Mozilla/5.0
(Windows; U; Windows NT 5.1; de; rv:1.8.1.13) Gecko/20080311
Firefox/2.0.0.13)

Same version on my notebook does not produce the error message, also
Internet Explorer has no problem accessing the site.
I have no troubles using other SSL sites.

What's wrong here? Is it a problem with my machine or a problem at
Vodafone (as the error message suggests)?

Julian
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