It's Key To Not Remove Yahoo Authentication File
Now that Yahoo has agreed to accept the Sitemap protocol , I've been going through the process of getting client sites authenticated via Yahoo's Site Explorer so we can submit sitemap files.
To be knighted as an authenticated site by Yahoo, you have to create an authentication key file then upload it to the root of your site. Once uploaded, you can request authentication.
We're finding it takes about 24 hours to get the thumbs up or down from Yahoo.
Just a tip for any of you doing the same.....
Once you upload the authentication key file and your site is authenticated, don't remove the authentication key. Yahoo will check periodically for the presence of the key and if it's removed, your site will be unauthenticated.