Iv just notice that a russian website has Proxy Hijacked our website and got it indexed in G results.. We have noticed a steady decline in our SERP positions since end of Jan. I found the copy site by doing a "quote" search of the tittle in G.
Could someone give me some advice on how we can stop them doing this and would this be the reason for the drop in results.
p.s it looks like they have proxy hijack wikipedia as well 1000's of other well known sites.
The key to understanding a rankings hijack by a proxy server is that googlebot (legitimate googlebot) is crawling your content using the proxy server's domain. A key defense strategy is offered by incredibill in an earlier thread:
How you stop this problem is to use REVERSE and FORWARD DNS to validate that Googlebot is coming from an actual Google IP, which returns a domain name that contains ".googlebot.com". If the reverse DNS of the IP that claims to be Googlebot doesn't contain ".googlebot.com", you simply bounce them.