I am trying to add a valid sitemap to Google Webmaster. Yet, it says:     Network unreachable: robots.txt unreachableWe were unable to crawl  your Sitemap because we found a robots.txt file at the root of your  site but were unable to download it. Please ensure that it is  accessible or remove it completely.and Network unreachable: robots.txt unreachableWe were unable to crawl  your Sitemap because we found a robots.txt file at the root of your  site but were unable to download it. Please ensure that it is  accessible or remove it completely.Yet, I can access both my robots.txt and sitemap.xml. I have reading other posts here and there, but could not solve/understand what is causing this issue. Anyone knows?
Network unreachable: robots.txt unreachable
google search console;sitemap;robots.txt
You probably want to check with your site's hoster to find out more. These messages essentially mean that Googlebot can't reach your site, which is generally something that happens more on the hosting side. We see a lot of unreachable failures for the domain overall, for what it's worth, so if they want to have those sites listed in Google's search results, it would probably make sense for them to figure out why these requests are being dropped.