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Re: why can't I visit this web site




On Tue, Jun 06, 2017 at 12:00:47PM -0400, Jude DaShiell wrote:
> I visited the site with lynx and got error 521 which I've never 
> encountered before. error 500's indicate access is forbidden generally 
> if memory serves.

HTTP 521 is "Web server is down", which is really confusing (obviously
it's not down or you wouldn't have been able to connect to it to get
that error).

Googling gives
https://serverfault.com/questions/845544/error-521-cloudflare-with-https-while-http-works
which suggests that perhaps the hostname is pointing to the wrong IP
addreess.

$ host www.cs.ecitic.com
www.cs.ecitic.com is a nickname for www.cs.ecitic.chinacache.net
www.cs.ecitic.chinacache.net is a nickname for f2a4b54c455789a5.cdn.jiashule.com
f2a4b54c455789a5.cdn.jiashule.com has address 219.153.73.220
f2a4b54c455789a5.cdn.jiashule.com has address 219.153.73.219

There are two IPs (basic DNS round robin), so it's possible that
one of them is "right" and one is "wrong", and each person testing
has a 50/50 shot of hitting the "wrong" IP.