forum archive not accessible anonymously

[Tom H]

On Sun, Aug 7, 2011 at 3:36 AM, Colin Law <clanlaw at googlemail.com> wrote:
> On 2 August 2011 07:40, Mihamina de Rakotomandimby
> <rakotomandimby at gmail.com> wrote:
>>
>> When performing Google search, I often get a "UbuntuForum" post as
>> result.
>>
>> Unfortunately, I get blocked because I must sign in to access the
>> content.
>>
>> 1°) Would you know why?
>>
>> 2°) I think Google indexes it anonymously, so why cant I read it as
>> anonymous?
>
> Can you provide an example of such a page?

It's happened to me too in the past.

For example,
http://ubuntuforums.org/showthread.php?t=359705
leads me to a login page rather than the thread.