I am searching a VPN provider which offers L2TP+Ipsec with certificate (and not a shared key/password) connectivity. I was previously using http://www.purevpn.com/ but they use a shared key for their IPsec.
The background of my question:
I am in China and had an iphone. The telecom operator i was using seemed to block PPTP VPNs, but L2TP+Ipsec was working, so i was very happy with PureVPN. I lost my iphone (sic) and am now using an Android smartphone. There is an app called 1VPN that can connect to VPN in one click instead of going to all the submenus to reconnect to VPN. But it needs the VPN provider to use certificate and not a shared password. Android is able to connect to l2tp+ipsec with shared password, but i assume there is some limitation or some issue that the 1VPN tool can not set this password automatically, but can set the certificate.
