So I noticed a couple days ago that Bitcoinica suddenly went down. I thought perhaps someone else would start a thread, but after a few days with no posts I decided to look into it more. Well, as you probably guessed from the subject, Bitcoinica is not down, but it appears Comcast's DNS servers are no longer resolving the host name. Digging a little deeper, I found the following:
First, here are the current DNS addresses for Comcast users (I think it's for all users):
http://dns.comcast.net/dns-ip-addresses.php75.75.75.75
75.75.76.76
I thought those IPs looked rather odd, but apparently they're legit -- and easy to remember. But do they do anything different? Well, here's a quote from the above page:
These IP addresses are distributed across many servers via Anycast for redundancy and reliability. As part of our ongoing efforts to protect our customers and provide great security features, DNSSEC validation is now automatically included as part of Comcast Constant Guard™ from Xfinity. Learn more about DNSSEC at our DNSSEC Information Center or by watching this short video.
Click on DNSSEC and you get the following page:
http://www.dnssec.comcast.net/Another potentially pertinent quote:
DNSSEC Deployment Completed!
Tuesday, January 10, 2012
As noted here on our blog, we have signed all of our domain names and all customers are now using DNSSEC-validating resolvers. Comcast is the first large ISP in the North America to have fully implemented DNSSEC, as part of ongoing efforts to protect our customers with Constant Guard™ from Xfinity.
So my bet is that somehow their DNSSEC initiative has decided that bitcoinica.com is not a safe website or something. Any thoughts on this? Other than changing my DNS server, it seems I can at least just connect directly to the Bitcoinica IP address (50.56.4.62), but https is not available if I do that, and come to think of it
https://www.bitcoinica.com gave me the crossed out https as well. Perhaps that is the problem: Bitcoinica's certificate isn't valid, at least with Comcast? Does that sound right? Anyone else have thoughts or other details on this?
