Technical Tip: Disable IPv6 SSL VPN

[Sgagan]

Description	This article describes a DNS issue where FortiClient is trying to do DNS lookup using IPv6 when it is enabled on the endpoint network adapter while using SSL VPN.
Scope	FortiGate, FortiClient.
Solution	When IPv6 is enabled on the network adapter settings on the Endpoint device, Windows would prefer IPv6 over IPv4.      To get an IPv4 address, it is possible to make these changes on the configuration file of FortiClient.    Take the backup of the current FortiClient configuration: Open the FortiClient Backup(.conf) with the text editor.  Search for <block_ipv6>0</block_ipv6> under <sslvpn> and change the digit from 0 to 1. When this setting is 1, FortiClient blocks IPv6 Connection and uses IPv4 only when the SSL VPN tunnel is up.  After making the change, save and restore the file back to the FortiClient. Connect to FortiClient and the IPv4 address will be now visible.