I got the message in google webmaster forum about Possible Outages. While crawling your site, we have noticed an increase in the number of transient soft 404 errors around 2012-06-18 18:00 UTC (London, Dublin, Edinburgh). Your site may have experienced outages. These issues may have been resolved. Here are some sample pages that resulted in soft 404 errors: For more information, see our Help Center: Soft 404 errors So, I want to know what is possible outage and how to solve it.