Do you even know what a 403 is? 403 forbidden - server declined to allow access to the page Now you know the problem - Something declines access to a page. Fix that
If you're already in Google Webmaster Tools console, try the 'fetch as Googlebot' function to see if that is also returning a 403. Double-check your robots.txt file, then your page heads for incorrect robots meta, and your server headers for incorrect configuration. If you find nothing wrong, it could be an issue with Googlebot at a time when there was some network issue. Re-submit the XML sitemap, ping, and wait/review.
A 403 Forbidden error will display if URL for a folder on your server that does not contain an "index.html" or "index.php" page. You can try clearing your cookies for that web site and trying again.
HTTP 403 Forbidden error occurred when you give limited access to a web domain or directory. Administrators can limit access to a web domain's directory by removing the anonymous user or requiring a password to view the content of the location. To remove or fix the error requires added permissions on the Windows host machine using the Internet Information Services (IIS) console. Once permissions are set, browsers to the domain will be able to access and read files normally again.