OpenVPN and Windows 8  Problem: Internet access slows to a crawl after establishing a VPN connection with OpenVPN. After spending several days trying to get the OpenVPN Client to work under Windows 8 I finally found a solution. I think the problem is a routing issue with IPV4 vs. IPV6. The solution is to go into you network adapter properties and turn of IPV6 on the TAP adapter. Here's a step-by-step guide: Stop OpenVPN  From a command line in Windows run: start c:\windows\system32\control.exe ncpa.cpl  Right Click on the TAP Win32 Adapter, select properties. Uncheck "Internet Protocol Version 6" and Click OK.   Run OpenVPN as Administrator