Internet stopped working on OS X 10.8.2
It appears you might have installed some software that would block access to those web sites. 

If not keep reading:

In some cases there is a possible modification to your HOST file.

In the assumption that you have no software installed that would explicitly block those sites here is how to block and unblock web sites.

A Mac’s hosts file is a simple text file that dictates what the system should do when specific domains or IP addresses are accessed. 

You can trigger a “page cannot be displayed” error or even redirect them to other domains/IPs of your choice. 

For the sake of this tutorial, all blocked websites will be pointed to 127.0.0.1, which is the localhost or system itself.


  
  To get started, Copy and paste the following code in Terminal:
  


sudo /bin/cp /etc/hosts /etc/hosts-original


Terminal will ask for your password. 

Now we can start editing the hosts file. Copy and paste this code in Terminal (all one line)

sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit /etc/hosts


The hosts file will open in TextEdit. 

Notice the following lines and do not delete them under any circumstances:


  127.0.0.1           localhost
  
  255.255.255.255     broadcasthost
  
  ::1                 localhost
  
  fe80::1%lo0         localhost


You should not have any further data here.

Create a new line directly under the last one shown above. Type the following, replacing the sample domain with the domain or IP
address you want to block:

    127.0.0.1 sample.com www.sample.com


Continue adding lines following the format in step 6 for each website you want to block. When you’re done, quit TextEdit and save the hosts file when prompted.

Back in Terminal, run the following command to flush the computer’s DNS and put the new hosts file into effect. Or you can restart your Mac instead, if you prefer.

sudo killall -HUP mDNSResponder


That’s all there is to it! Websites added to the hosts file will no longer be accessible from any user account on that Mac. 

In your case look for the blocked IP's


re-enable access to blocked websites, just repeat this process and
remove the lines you added in the hosts file. Just remember not to
delete the original 4 lines!


In some cases the sshuttle (an VPN over ssh) cloud changed my /etc/hosts file.