Consider the following scenario:
You have a computer that is running Windows RT 8.1, Windows 8.1, Windows Server 2012 R2, Windows RT, Windows 8, or Windows Server 2012.
You connect the computer to a wireless network.
You try to establish a virtual private network (VPN)connection by using a third-party application.
In this scenario, the VPN connection cannot be established if the wireless signal is unstable and the status frequently changes between strong and weak.
When you try to establish the VPN connection, the VPN application adds static routes that relate to the Wi-Fi interface to the VPN server. The Wi-Fi interface receives incorrect signal notifications if the wireless signal is unstable between strong and weak. Therefore, the static routes cannot work correctly.
To resolve this issue, install update rollup 2975719 or update rollup 2975331. For more information about how to obtain these update rollup packages, click the following article number to view the article in the Microsoft Knowledge Base:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates