a penalty all of a sudden?

[flex55]

gradually, my yahoo traffic grew over the past few months (since yahoo's switch off of google)- making yahoo responsible for 50% of my traffic.
however, all of a sudden- site is gone from yahoo index. site:domain returns 0 results, yet linkdomain:domain returns all the links I had before.
0 traffic referred from yahoo.

my site is white (no black-hat seo)- works fine with google and the rest.
does anyone have any idea? have they applied a new filter just these days? i'm really lost here. i wrote to yahoo and of course didn't get anything yet.

[yowza]

They just had an update a couple of days ago. Many people reported losing pages. I'm not sure why you lost all of your pages. How many pages did you have in the index?

I would recommend making getting a couple of new inbound links and make a few on-page changes. If Slurp sees new content, he may decide to dig deeper.

[jasoncrouch]

I had the same thing happen a few days ago. My site was at #1, 2 or 3 for all of our major keywords on Yahoo, and firmly at #1 on Google for everything that we care about. As you described, Yahoo was gradually bringing more traffic, then we disappeared completely from the index.

I can't figure out anything that we have done wrong to cause this - no black hat tactics, no doorway pages, hidden text, etc.

I wrote to Yahoo and received a form letter describing possible reasons that a site could be banned, but it was no help.

It looks like Yahoo Slurp is continuing to visit my site, but I have the feeling that we are on some sort of "do not index" list (just a feeling for now).

[Asifm]

does any one know how exactally we can find out if we are banned by yahoo?

We are unable to see our site even by domain in yahoo index and yahoo bot continously visit our site.

[Marcia]

Do a search for some unique phrases on your site using quotes - or even internal pages that disappear - and see what comes up. I've seen some sites using 302 redirects, their URLs are showing up in the SERPs instead of the pages that the content is really on.

That's one scenario. In other cases, there are tons of scraped pages being generated on some crummy sites, and they're flooding the index with duplicates without the site owners knowing anything about it.

[zeus]

flex - this is disscussed here [webmasterworld.com...]

I have the same problem 2 times a month, I dont think its a penalty or a change in yahoos way to list sites, sometimes some pages just slip out of the index, I also have 2000 links to me on yahoo, but nothing shows when I make a site: search, the site is fully html static site.

like I said I have not send any email to yahoo, because I dont think anything has happen, they just made some mistakes.

zeus