Slightly less Random Ramblings

August 21, 2013

OpenVPN Not Passing Traffic on Windows 8 Professional using UDP

Filed under: computing, encryption, OpenVPN, security, Windows — Tags: , , , , , , — Robert Wicks @ 7:25 am

Windows 8 Pro (which is the version I have. I cannot comment on other versions) appears to have an issue with a normal OpenVPN tunnel. When using UDP, my VPN does not pass traffic. It does pass that traffic when I use TCP. Additionally, a Cisco SSL VPN (also UDP based) I use does not work. After browsing about a bit, I found that the UDP encapsulation settings have an effect on this. The registry setting which needs to be changed is:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent]
“AssumeUDPEncapsulationContextOnSendRule”=dword:00000002

After rebooting, both of my VPNs worked, fixing an issue which nearly made me abandon Windows 8.

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