Webmaster Tools Zero URLs in Web Index Overnight

[JSOC]

All,

Strange occurrence: My WM Tools shows 0 URLs in the web index. It was 930 something yesterday. Any ideas as to why? Any fixes?

I recently changed the preferred domain.

Any help would be appreciated.

[EGOL]

The URLs on my site in WMT slowly migrated to the new domain.  My change was done in February and there is still a little activity in WMT for the old domain.  But new domain is very healthy.

[JSOC]

EGOL, Thank you. A site:www.mysite.com search reveals over 1,400 indexed pages.

I've claimed both the preferred and non-preferred domain in WMT and the redirect is working. Non-preferred is redirecting to preferred. The preferred domain was showing over 900 URLs in web index yesterday.

Luckily, traffic isn't being impacted.

[EGOL]

I recently changed the preferred domain.

Check the NEW preferred domain (and be sure to claim it in GWT) .  If nothing is there yet give it some time.   I don't know how much time because I didn't do daily checks on the two domains that we moved in the past year.... but one day the new URLs were there.

The important thing is what's happening in the SERPs and if you executed the redirect properly.