Problem accessing wp-admin and entire website

Hi all,

I have the following problem. I set up a website some months ago, under the adress https://www.marmott.ch. Everything was working fine, even upgraded without any problem in 2.7.

But now, without having changed anything these past days, when visitors try to access the site, loading it takes hours if they eventually get any answer. More embarassing, I can’t access at all to the wp-admin page, where I could see where the problem comes from. When trying to access this admin console, i get the following message :

ERROR
The requested URL could not be retrieved

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While trying to retrieve the URL: https://www.marmott.ch/wp-admin/

The following error was encountered:

Zero Sized Reply
Squid did not receive any data for this request.

Your cache administrator is ([edit]myhostname mail address, which I don’t want to make appear on this forum post[end edit])

——————————————————————————–

Generated Wed, 18 Feb 2009 12:40:01 GMT by localhost.localdomain (squid/2.5.STABLE10)

Did any of you encounter the same problem and/or if not, does anyone have some clue on how to resolve this matter ?`

Thanks very much for helping on this matter…
Rgds