hello again,
i have the reason why Windows 8.1 does not work with the SSL VPN xtunnel.cab. Last Friday i called the Support Hotline from Dlink and spoke with a Support technician from the 2nd Level Support.
He told me, the xtunnel.cab on the Dlink Firmware doesnt work with Windows 8.1 or Windows 9.1 doesnt Support the xtunnel.cab from dlink., Dlink are work now at a solution, ist a problem with the ssl drivers so the Support techician.
i will try it with Windows 8 and give you a message.
thank you
Flosch