系統(tǒng)windows8.1。第一次用cisco連接公司內(nèi)網(wǎng)，就出現(xiàn)了unable to establish vpn的問(wèn)題。不是賬號(hào)、服務(wù)器的問(wèn)題。網(wǎng)上百度了好久只找到比如去除共享、刪除其他網(wǎng)絡(luò)配置、打開端口等等方法都無(wú)法解決。當(dāng)時(shí)是懷疑是系統(tǒng)配置問(wèn)題，在虛擬機(jī)xp里連接了一下，成功連接。于是試了下用兼容模式xp運(yùn)行cisco vpn客戶端，步驟如下： 右擊安裝文件夾里程序文件，屬性-兼容性-以兼容模式運(yùn)行這個(gè)程序-windows xp(sp3)。 我將文件夾里所有程序文件都設(shè)置了一遍，重新運(yùn)行主程序，unable to establish vpn問(wèn)題解決了。不過(guò)又出現(xiàn)了新的錯(cuò)誤提示：The VPN client driver has encountered an error 這個(gè)錯(cuò)誤網(wǎng)上可以找到解決辦法。如下： 1.管理員運(yùn)行 2.修改注冊(cè)表：運(yùn)行regedit 3.找到HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesvpnva 4.找到有鍵值Cisco AnyConnect VPN Virtual Miniport Adapter for Windows x64的項(xiàng)，將該值前面的字符串刪掉，只保留Cisco AnyConnect VPN Virtual Miniport Adapter for Windows x64。然后重啟一下就可以了。
（原文：Seen this error when trying to use the Cisco client with Windows 8? The VPN Client driver has encountered an error. The fix for me was pretty easy. Go into registry and go to: HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesvpnva Check the DisplayName data value. On my installation, it had a bit of inf information before the actual name. So deleted that info, and was left with just Cisco AnyConnect VPN Virtual Miniport Adapter for Windows x64. Fired up the VPN Client and connected without any problems）