Hi, webmaster tools for my site displays that

robots.txt unreachable and for all links in sitemap it says network unreachable. sitemap.xml unreachable.

These appear in crawl stats page.

I discussed with the support team of my hosting and they said...

Hi,

I have verified apache logs, i cannot see any issues on your website/webserver/

Possible issues.

1. There may the routing issue from the googles server to our server.

2. When a google bots hits goes high the IP will be automatically blacklisted by our firewall to avoid server loads & downtimes.

As we donot have access to their services, We cannot able to give details of their details/logs etc.

The sitemaps link shows an exclamation mark which means the file was not reachable.

What could be the problem and how to solve it?