The causes are considered to be the following 3.

In case the IKEv2 is unavailable for the following restriction, please try OpenVPN.

1. The restriction of router
   • First of all, please confirm the contract provider(The maker of the router you had purchased or the router provider) if IKEv2 connection or IPSec connection is available or not.
   • The name of setting item differs depending on the model however the settings of "VPN pass-through" or "VPN multi pass-through" should be "Valid" in the broad band router at home etc .(Please refer to the manuals of router.)
2. The restriction at network environment
   • Please confirm the provider because there is a restriction in the contracted provider. 500/UDP port and ESP are used, but if the terminal has private address under NAT, 4500/UDP port is also used.
   • Please confirm the network manager because there is a restriction in the network provided in the institute.
   • There are cases that it is unavailable in the hotel or with the public wireless LAN service.
3. The restriction in the anti-virus software
   • Please check the manual because there is a case that the connection is restricted due to the anti-virus software.