Googlebot can't access your site - Server connectivity - Unreachable page3 Recommended Answers
Thanks for providing relevant details.
From what you say, I think that three main possibilities are likely:
1. Merely transient errors - something happened momentarily that prevented google from getting an appropriate response.
(NB. You said ' Ever since around 1am last night, Googlebot has been getting a 33.3% failure rate at connecting with my site.'
If you mean that you have only experienced this error in the last day or so, I think it too early to identify a traceable "cause".
2. You mentioned your "hosting" but if your domain registration is provided separately from your hosting, there could be a problem with DNS outside your hosting.
3. If the error persists for some longer time (days/weeks) it may be that your hosting company firewall is blocking SOME google IPs and not others. This is sometimes done accidentally or deliberately temporarily and then mistakenly forgotten. It can even happen automatically if they have in place a system that blocks IPs simply because they making "excessive" requests/demands.
Also note that if the "errors" only started occurring in the last day or so, it may take some time for the issue to be reported in Webmaster Tools.
--- keep under review for a longer time;
--- use Fetch as Google to check ability to access the site;
--- take care not to misinterpret the results. e.g. google typically requests robots.txt up to once a day; therefore if there was a problem accessing your robots.txt some hours ago, it could still affect FaG now. i.e. if FaG does not recognize that it is OK to crawl at this time, it may defer to another day. That does NOT mean there is still a problem right now.
Also note that "server connectivity" includes things that do not indicate misconfiguration in the DNS or the hosting of the domain.
For example, a "timeout" due to the server being overloaded at that time.
I'm sure we have all faced situations where a site fails to respond, but then seems to come to life again a few minutes later.
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