I think this is what happened to my site, a proxy created a mirror, copy of my site then the copy of my site was indexed and my site was penalized for duplicate content.
This is the identical copy now blocked with a script from my site:
Take a look here: http://www.localdomain.ws/wml6eb23q/...6p75732r6r6574
This is the proxy indexed with my content:
Link to Google
Is the first time ? no, happened twice, first time another site was penalized and i was not able to rank for my domain name. "domain-name.tld" anymore even after few months.
Also saw this article: Google Proxy Hacking: How A Third Party Can Remove Your Site From Google SERPs
Letest conclusion from this blog:
What do you think?Update again: September 2009 - damned if this thing hasn't cropped up again – now it looks like Google's replacing the duped URL with the copy's URL – and even RANKING the duplicates… (similar to the already-known-and-passed-off-as-a-feature 302 redirect bug).