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I January, I saw 3 sites that I work for, disappeared from Google index.
After lots of hours of Research, IP scan, Pages Reviews and etc., I noticed that the only common point is those domains are hosted on a microsoft server with IIS 6.0.
Last week I found one of them back in GG since the Website was moved in a Apache hosting solutions. More, the site came back with is same old content - not with a fresh crawl from google.
This situation let me suspect that GG seems to have problem to parse the headers of IIS. Especially with the "Modification-Date" header.
So my question to all readers of webmasterword is :
- If Your site have recently disapear of GG, does that site is Host on Microsoft-IIS/6.0?
May Be I'm loose my time on that path and your.
Your Answer should let me see.
Thanks to all
But in working with IIS sys admins and developers, I have noticed that there are several pitfalls that seem to be commonly made on IIS that can also make for indexing troubles.
The biggest culprit is in placing a redirect -- a 302 [temporary] is the default. You must check an extra box if you want a 301 [permanent] redirect. 302 redirects can create all kinds of canaonical problems, dupe content, on and on. If the page will not be coming back to a url, the redirect whould be a 301.
Essentially, many of the technical problems, listed in the links from the following thread, are extremely easy to create by accident on IIS: