6.4.3 Fortclient - SSL VPN intermittent disconnections

Please check the below KB

This article describes random or intermittent disconnections of the SSL-VPN tunnel to the FortiGate when connected with FortiClient

https://community.fortinet.com/t5/FortiGate/Technical-Tip-SSL-VPN-disconnection-issues-when-connected-with/ta-p/207851#:~:text=By%20default%2C%20a%20SSL%2DVPN,hours%20due%20to%20auth%2Dtimeout.&text=The%20idle%2Dtimeout%20is%20the,300%20seconds%20(5%20minutes).

Hello 

Are you sure the VPN Connection is the culprit? The symptom of wi-fi connection dropping might only be made obvious because the user is connected to the VPN, There could be a possibility that wifi is having disconnection please check wifi connectivity also.
Thanks & Regards 
Mayank Sharma

Hi,

Intermittent disconnections from SSL VPN connections can be caused by various factors, including network issues, client settings, or firewall configurations.

Please refer to the below link to troubleshoot the SSL VPN intermittent disconnection.

https://community.fortinet.com/t5/FortiGate/Technical-Tip-SSL-VPN-disconnection-issues-when-connected-with/ta-p/207851#:~:text=%2D%3E%20Authentication%20Timeout%20and%20idle%20timeout,hours%20due%20to%20auth%2Dtimeout.&text=The%20idle%2Dtimeout%20is%20the,300%20seconds%20(5%20minutes).

Also, if you are using the standalone FortiClient version, you may try to use any other version and monitor the issue.

BR,

Manosh

HI @Icebun 

Can you please fetch more information from VPN logs and Forticlint logs to see why the user getting disconnected?

And Please is the Forticlient version is compatible with fortigate firmware

Please refer to the below link for compatibility.

https://fortinetweb.s3.amazonaws.com/docs.fortinet.com/v2/attachments/afec3249-ed3f-11ea-96b9-00505692583a/ems-compatibility-chart.pdf

Regards,