Sometimes our private DNS servers may cause problems when a VPN does not get disconnected properly. This can happen without your knowledge (Upstream network issues). A simple way to tell if this is the issue is to see if your IP client or other internet connected applications work. If they do but you cannot browse websites then you will want to check your DNS settings.

To check your DNS settings on a Mac OS X follow these steps.

1. Open your System Preferences
2. Open Network
3. Open your connected adapter
4. Select DNS
5. Use the +/- symbols to add and remove DNS servers.
6. If you see 10.10.10.10 as your only DNS server add 1 or more of the following
   1. OpenNIC - Grab 2 DNS servers from the OpenNIC project
   2. Google DNS - 8.8.8.8 and 8.8.4.4
   3. OpenDNS - 208.67.222.222 and 208.67.220.220