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A total ban is unlikely unless your trangressions have been extreme, and you should double-check de-indexing with other searches I suggest.
First, make sure that your pages are returning a 200 OK status on a server header checker.
Then, double-check that your syntax for the site:domain operator is correct. There should be no space after the colon. Ie, your syntax should be...
Not (with a space)..
Also, do some Google searches for unique word strings from your pages (use a 4 or 5 word string and enclose it in quotes), to see whether your pages are in the index.
Search also for example.com. If you get no results and if you've confirmed that your server is set up and functioning properly, then check the Google Webmaster Guidelines [google.com], particularly the basic and specific Quality guidelines, to see if you've done anything that might warrant a total ban. This would be what Google classes as "deceptive or manipulative behavior", and while Google is not completely precise about what this behavior is, it's likely that if you've been engaging in it, some part of Google's descriptions will ring a bell.
You should also read through the Hot Topics section [webmasterworld.com], which is always pinned to the top of this forum's index page. Look particularly at the Penalties, Sandbox & Trust area.
PS: Submitting a reconsideration only makes sense if you've diagnosed and fixed whatever Google violations you've been penalized for. Make sure your site is very clean when you submit such a request, as you will be getting a manual check.
[edited by: Robert_Charlton at 8:02 pm (utc) on Dec. 30, 2008]
I'm not sure you tried Charlton suggestions about using the site:www.example.com command.
If you did and zero results are found then your site has probably been removed by google for violating their policies.
What are the latest changes/additions you've done?
Also, you say the urls listed as "not found" in webmaster tools never existed.
Are you sure you're not using a CMS that may have generated those urls and you didn't notice?
Are you sure 100% your site has not been hacked lately?
I have used the site:www.example.com and nothing is found.
I ahven't made any changes in at least 3-4 months which are significant. Just adding articles.
Not using CMS but hacked could be a possibility. What would you recomend...I'm very desporate at this point.
Dashboard > Overview
You should see:
Home page crawl: Googlebot has successfully accessed your home page.
Index status: Pages from your site are included in Google's index.
Pages in your Sitemap(s) are included in Google's index.
Below that you should see:
Errors for URLs in Sitemaps 0
HTTP errors 0
Not found 0
URLs not followed 0
URLs restricted by robots.txt [a number here]
URLs timed out 0
Unreachable URLs 0
Then when you click Diagnostics > Content analysis you should see: "We didn't detect any content issues with your site."
When you click "Sitemaps > Overview", you should see:
Total URLs: [a number here]
Indexed URLs: [a number here that matches the number above]
Then under "My Sitemaps" you should see: Status > OK
If all that checks out as above, then it's at least possible that the problem is not with you, so you may have to request a manual review by Google tech support, to confirm that this issue is not a glitch on their end. If you've not done that already, you can go back to the Dashboard and click "Request reconsideration".
I had a problem with one of my sites yesterday itself with site: commnad. It displayed 40K pages being index when my site had only 5K. Though other datacenters show the correct figures of around 4.5K as usual.
This was resolved after about 2 hours.