As discussed, sometimes while you are using a VPN occurs in what are known as DNS Leak or escape of DNS
Since the virtual private network, saturation or other failure, it takes to respond to a request for access, Windows changes the VPN DNS for the DNS servers without protection we use substructure, exposing our connection. It is a rare failure, but it happens.
If you use a VPN and want to know if your connection suffers leakage of DNS, can perform a check in the web DNS Leak Test.
This page examines your connection and tells you if you can suffer DNS leaks. If is so, then you must ensure you of that your computer only can connect is to those servers DNS of the VPN.
To do this you must set a static IP address if you are using DHCP, before connecting to the VPN. Once connected you deactivate the standard DNS configuration, so that Windows only to find the DNS of the VPN. After leaving the virtual private network, you must reset DHCP and reconfigure the DNS standard. In this web you explain how to do it, both of form manual as with a program.
Although not is very common, especially if the service VPN is of quality, can occur that the software that manages the network private virtual is block, produce a failed, or disabled by a virus, or by a user that it has off without giving is has.
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VPNCheck is an application that checks your VPN is working properly and prevents such problems. If it detects that the VPN has stopped working or an inexperado change has occurred in the connection, it is able to close the connection to the Internet and stop the programs that you specify. A message on screen you alerts of that something goes wrong. If the connection is recovers, also can return to put up those programs closed.
You can download from this link the version free of VPNCheck, available both in Windows as in Linux. It is compatible with the PPTP and L2TP protocols. The paid version you need to use OpenVPN.
To monitor your VPN and close a specific program when a failure, simply press the Config button, and add the name of user, password, and the name of the VPN adapter that you are using (shown in the networks of the Windows Control Panel section).
You must then click RAS and Add File to search the file for start of the program that you want to stop. Mark the check-box AutoRun. Exit Setup and press Cycle IP: Task, to complete the process. You have more detailed instructions in this quick guide to VPNCheck.
Passes using VPNetMon, start up application and click the Opt to select the programs that you want to block when the VPN fails, searching for them on your hard disk. When selections one checkbox Control, and press the Save button to save your selection. This you have to do it the first time with at least one program before starting virtual private network. Once you’ve added at least one program, start up the VPN, and already use VPNetMon.
Keep in mind to make it work you must boot programs to monitor from inside of VPNetMon, by pressing the button A1. Have instructions detailed in the website of VPNetMon.