This is also a Dell laptop running Windows 10 2004, but with a different brand of network adapter. This is running the same FortiClient, and this has a solid, reliable SSL VPN connection with no random disconnects. I have another laptop, also connected through WiFi to the same ASUS router. I have checked Windows Event Logs for any relevant issues at the time of VPN disconnection.It identifies a disconnection, but offers no real information that points me to the issue I have run diagnostics on the FortiClient.I have checked on Dell's website for newer network drivers.I have uninstalled/reinstalled my WiFi adapter (Killer Wireless-n/a/ac 1535 Wireless Network Adapter).I have upgraded to the latest version of FortiClient.I have uninstalled/reinstalled the FortiClient software.I have tried 2.4 and 5 GHz WiFi connections with no improvement.My router is a high end ASUS model with the latest firmware.My WiFi connection is stable, with strong signal and it does not ever drop out.
What I cannot work out is why the VPN is dropping and why it started after my upgrade to Windows 10 2004. I understand that a VPN relies on a solid uninterrupted network connection and if that fails, even briefly, it can cause the VPN to drop. Each time, the WiFi is still connected and I can immediately reconnect the SSL VPN with no issue. I usually experience around 6 disconnections per day. Disconnections are totally random, I can last 8 hours uninterrupted one day and the next day 10 disconnections throughout the day, some within 5 mintues of each other. By rare, maybe once a week.Ī few months back, the laptop had a Windows 10 feature update from 1909 to 2004 and from that day onwards, the VPN has started to behave unreliably. Over the past 18 months, the FortiClient VPN has been incredibly stable and unexpected VPN disconnections were rare. I have a laptop (Dell XPS-15 9560) running FortiClient 6.x SSL VPN which connects through to a Fortigate firewall.
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