Simply put, if you can connect TCP protocol but cannot connect UDP Openvpn client in Windows 8, you might want to give this a try - edit the registry. I am not able to resolve host after connecting to Openvpn UDP protocol on Windows 8.
Taken from: http://support.microsoft.com/kb/926179
To create and configure the AssumeUDPEncapsulationContextOnSendRule registry value, follow these steps:
Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent
On the Edit menu, point to New, and then click DWORD (32-bit) Value.
Type AssumeUDPEncapsulationContextOnSendRule, and then press ENTER.
Right-click AssumeUDPEncapsulationContextOnSendRule, and then click Modify.
In the Value Data box, type one of the following values:
0
A value of 0 (zero) configures Windows so that it cannot establish security associations with servers that are located behind NAT devices. This is the default value.
1
A value of 1 configures Windows so that it can establish security associations with servers that are located behind NAT devices.
2
A value of 2 configures Windows so that it can establish security associations when both the server and the Windows Vista-based or Windows Server 2008-based VPN client computer are behind NAT devices.
Click OK
Restart the computer.
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