Several solutions for when Google can't verify your website - Lin Net Blog

Today, while creating Google sitemaps for a few websites, I suddenly discovered that the long-unresolved site verification in Google Webmaster Tools was finally resolved with a small modification. The persistent message "Google cannot verify your website: We were unable to verify your file due to server timeout" disappeared and was replaced by a successful verification prompt - which is truly gratifying. When encountering the issue "Google cannot verify your website: We were unable to verify your file due to server timeout," you can consider these four potential causes: CNAME records, dual-line hosting, DNS settings, and 404 page configurations.