The issue is that cloudflare uses headers that don identify the ip adress they 
are making the request on behalf of so gae sees them as a dos attack when their 
round robin requests don't round robin enough.  

this will happen a lot when bing bot or google bot comes though to index your 
site.

Also if you have a site with more than 5000 pages you will find cloud flare 
often results in the cloudflare captcha being indexed.

Sent from my Samsung Epicâ„¢ 4G

"Martino A. Sabia" <[email protected]> wrote:

>Problem disappeared without any change made either on my site or in 
>CloudFlare, so I don't think it depends on their service. 
>
>It would be great to know by Google what happened, since the message cames 
>from them, but i suppose it will not happen :(. My only idea is that it has 
>something to do with Ipv6 day, but i have no evidences to prove this.
>
>Brandon, I don't know if CloudFlare lied to me, I don't understand why they 
>had too, but i have appreciated the fact they even responded to me even if i 
>have only a "free" account on their service... enough said? 
>
>The great trouble in all this is, in my point of view, that there is no way 
>to have some kind of response from google even if i'm an early adopter of 
>appengine and pay for their service. That scared me a lot.
>
>Martino.
>
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