why it keeps disconnecting?

Hi,

May I know if this issue is observed for all the users?

Please share the Fortigate and Forticlient version.

BR,

Manosh

First, please check the VPN Events to find the possible reason for disconnects.

It might be packet loss between the sslvpn client and the fortigate.

Also refer to that KB : https://community.fortinet.com/t5/FortiGate/Technical-Tip-SSL-VPN-disconnection-issues-when-connected-with/ta-p/207851

Hello @mercy_angel,

Set the security user authentication timeout to control how long an authenticated connection can be idle before the user must authenticate again. The maximum timeout is 4320 minutes (72 hours).

To set the security authentication timeout – web-based manager:

Go to User & Device > Authentication Settings.
Enter the Authentication Timeout value in minutes. The default authentication timeout is 5 minutes.
Select Apply.

Set the SSL VPN user authentication timeout (Idle Timeout) to control how long an authenticated connection can be idle before the user must authenticate again. The maximum timeout is 259 200 seconds. The default timeout is 300 seconds.

To set the SSL VPN authentication timeout – web-based manager:

Go to VPN > SSL-VPN Settings.
Enable Idle Logout and enter the Inactive For value in seconds.
Select Apply.

Thanks
Pavan