W10 on virtualbox

[enig]

Hi, I using ubuntu 16.04 LTS. My workspace Windows 10 and work on virtualbox. I install FortiClient 5.4.1.0840 AV signature :40.599, AV engine: 5.233 on W10 virtual machine. We have Fortigate 100D v5.4.1,build1064 (GA) FortiClient color is yellow and need reboot after logon. This reboot looped. I try reboot many times...

Many times not response virtual machine... I clicked "Do Not Reboot" button. I try VPN connect but not connected and no error. FortiGate \ Log & Report \ VPN messages; No | Message | Reason 1 | SSL new connection | N/A 2 | SSL new connection | N/A 3 | SSL tunnel established | login successfully 4 | SSL new connection | N/A 5 | SSL new connection | N/A 6 | SSL new connection | N/A 7 | SSL new connection | N/A

8 | SSL tunnel shutdown | tunnel connection setup timeout for SSLVPN Client 9 | SSL tunnel shutdown | tunnel connection setup timeout for SSLVPN Client What is wrong, please tell me?