I recently helped a client move a domain from their malware infested site, to a new site. However I received heavy traffic for requests that were clearly no longer on the site.
The malware had created and submitted a new site map to google, which google then proceeded to crawl consistently, so now google is constantly making bad requests for bad files which if you are not careful can trigger certain firewall settings and block the google crawler.
This isn’t so much of a question so much as it is a story as this type of attack if not properly rectified quickly in google webmaster tools can have serious consequences.
Has anybody else experienced this type of scenario and what are the best practices you have employed to fix these situations other than fixing the site map in google webmaster tools, and white listing the google crawler ips.