The vendor type for Fortinet VPN is needed for LDAP to RADIUS mapping inside the Radius Validation server.
The name has to be encoded inside attribute 26 – which corresponds to “Vendor-Specific” in the VIP configuration.
Within the encoded response, you can define what type of data you’re returning. In Fortinet’s case, Fortinet-Group-Name corresponds to a Vendor Type or ‘1’. The full list is here: http://kb.fortinet.com/kb/documentLink.do?externalID=13837
Their vendor ID is known as 12356.
Group not being presented to Fortinet in the correct format when attempting to login.