We recently used the URL:
http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=YahooDemo&url=....
To ping Yahoo about sitemap changes. This URL turned out to time out and is not reachable.
Then I googled and on the Yahoo site I found a different URL which also times out:
http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=....
What is the correct address to ping Yahoo about sitemap changes?
http://submissions.ask.com/ping?sitemap=
gives 404