posted on Dec, 7 2013 @ 07:50 AM
I seriously doubt that NASA websites have blocked your IP.
First, see if anyone else you know in your immediate area, and with the same ISP is having problems with the same sites you are.
Borrow a friend or family members laptop, and try to access NASA websites from your home.
Call your ISP, and ask them if they are having problems with any domains. (This does happen occasionally)
I'm not sure where you are, but if you are outside the USA. There could be some issues there.
Give your computer a good cleaning. Clean out junkfiles with something like Ccleaner.
Also, Lightassassin is right. Pinging those sites will help determine where the issue lies.