All our sub domain pages indexing are going down. What’s the best practice to find the issue?
JOHN MEULLER (Webmaster Analyst from Google):
That’s really hard to say without looking at the website. So sometimes what happens if you have a lot of different sub domains that are actually showing the same content, we’re perhaps folding things together and picking one canonical that’s on one of these pages instead of indexing all of the different versions. Other than that, there are lots of things that can lead up to the indexing of pages going down– everything from crawling issues, to maybe duplicate content issues like I mentioned, to meta tags, technical issues on the pages. All of that is kind of possible. What I’d recommend doing there is going to one of the webmaster help forums and getting advice from peers who have probably seen similar cases in the past, and who can look at your specific situation say, yes, this is a problem, or no, this is not a problem that you need to worry about. And maybe they can even give you some tips on what you can do to improve your website overall.