Two days ago I faced a queer problem that I'd never faced in my whole 2 years+ experience of blogspot. Every time I entered my "blog-url" in my Firefox I would get the following errors:
I freaked out ... WTF??? .. I even posted on my FB wall ... "Surprised to know that even a Service Provider like Google could experience downtime....." A chilling thought even ran into my mind ~ "Had Google blocked my blog?"
But after some "googling" and waiting I found out ~ All My Guesses Were Simply Wrong!!!! The problem had nothing to do with Google | Blogger. The problem lied with my ISP and the Dynamic IP assigned to me by my ISP (Internet Service Provider."
I simply visited http://proxy.org/ and accessed my blog and Voila!!! I could access my blog quite conveniently. Then I called up my friend who works for IBM and asked him to check as to whether he could access my blog(s) from his home-computer. And again, YESsss he could. Again I used an IP changer software, which creates a "dummy IP" to conceal your IP. Here I changed my IP to Plano, Texas, US and again I could access my blog.
Now with all these test I became sure of the possible problem and it had nothing to do with Blogger | Google. The problem was with nobody but my ISP.
I guess either you wait and see if the problem resolves on its own. In the sense, if your ISP has assigned you a "Static IP" then I guess you call 'em up ASAP (immediately) and tell them about the problem ~ a DNS error that you're facing while trying to access blogspot blogs. If you are the one with a Dynamic IP then you can well wait for sometime; because a Dynamic IP is never the same unlike Static IP. Dynamic IP changes each time you shutdown and restart your computer. Once you have a new IP it should resolve matters for you.
Well the above scenario worked for me that's why you can see I am able to make this fresh post.
Hope it resolves matter for you too. Feel free to feedback.
You might also find helpful information here: Blogger FAQ