This is a known bug related to the Firefox problem. SSl vpn client plugin will not work if you use a version of Firefox higher than 20 Link to error identifier (0211153). The intent workaround at this time would be to load the standalone sll vpn client. See the link below to download standalone ssl vpn or revert to a previous version (e.g. 21)
Download SslvpnClient.msi from http://dekiwiki.ties2.net/Fortinet/Fortinet_SSL_VPN_Client_Installers
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