Internet connection stops when connected to VPN service

Using a VPN service can help to change your IP address, is great for the sense of security and protects your privacy. However, the Internet connection may stops when you connect to VPN servers. Fortunately, there are now a number of ways to let the internet work after connecting to VPN servers.

This is a problem that can easily be bypassed, and all you need to do is to change the DNS servers you use. The easiest DNS service for free is Google DNS: 8.8.4.4 or 8.8.8.8 .
If your Internet connection stops after connecting to VPN service, you will probably need to change your DNS servers to one of those mentioned above. 
Here we will describe how to change your DNS servers.
CHANGE YOUR DNS PROVIDER IN WINDOWS 8
Open network connections
Right click on your WiFi connection and select Properties
Select TCP/IP version 4 and click properties
Copy and paste the DNS servers of the service you prefer into the fields for DNS servers
If it still does not work, restart your computer and try again

CHANGE DNS IN EARLIER WINDOWS VERSIONS
Refer to the control panel and select "View network status and tasks"
Press Network and Sharing Center followed by Change Adapter Settings
Select your Network adapter (WiFi) and press Properties
Select Internet Protocol Version 4 (TCP/IPv4) and select Properties
Select "Use the following DNS services" and copy one of the solutions mentioned

CHANGE DNS ON MAC OS X
Choose System preferences and Network
Choose the connection in use (either Ethernet or WiFi) and click advanced
Select DNS and add the DNS server information
Click Apply

CHANGE DNS SERVERS IN UBUNTU
Click System, Preferences, Network Connections
Select either wired (Ethernet) or Wireless connection based on what you use.
Click edit and select either IPv4 or IPv6 options
If option is Automatic (DHCP) change it to Automatic (DHCP) addresses only. Then go ahead and add the needed information to the DNS servers.
Click apply and you are ready to go!