Windows 10: After Security Update KB5048685, Forticlient VPN is not working. How to fix this?

Hi,After Security Update KB5048685, Forticlient VPN is not working. Not able to uninstall Security Update KB5048685 also. Its urgent please help.Thanks,Prem

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Forticlient VPN doesn't connect in Windows 11

Forticlient 6.4.7 and 7.0.2 have Windows 11 support now.

Anything older is not support or tested.
Installation requirements | Administration Guide

1. Note VPN client settings & backup them up
   
2. Remove Forticlient
   
3. Check your computer hardware is supported in Windows 11 (mostly nic/wifi)
   
4. Updated your NIC/WIFI Drivers for your hardware.
   
5. Update nic/wifi firmware if possible
   
6. Install Forticlient 6.4.7 or 7.0.2 or newer builds
   
7. Configure your VPN connection from scratch/new profile.
   

 

Windows 10 FortiClient VPN Crashing

Hi,

I updated to Windows 10 1903 (KB4512508). Have FortiClient VPN and now when I try to connect to the VPN when it ask to allow the certificate goes bluescreen. Tried unistalling Forticlient, tried an old version.

Any help on this.

 

How to Fix FortiClient unable to establish the VPN connection. The VPN server may be unreachable (-8), (-14), (-6008), (-5), (-20199)

Whenever i try to connect to FortiClient VPN in Windows 10 computer, it fails to connect and saying ‘FortiClient unable to establish the VPN connection. The VPN server may be unreachable’ along with some error codes (-8), (-14), (-6008), (-5), (-20199), or other error codes on error window. This error codes indicates unable to connect to FortiClient SSL VPN in computer for some reasons.



Is there any solutions to fix these FortiClient errors problems?

However, there is some workaround solutions available on the web where How to Fix FortiClient unable to establish the VPN connection. The VPN server may be unreachable page mentioned some effective solutions. Here is the solutions.

Method 1: Change TLS version

This issue can be occurred due to mismatch TLS version in computer. You can fix the issue by changing TLS version to fix.

Step 1: Open ‘Internet Options’ via Windows Search Box and in the opened window, click ‘Advanced’ and scroll down to check ‘TLS version’

Step 2: If ‘TLS 1.2’ version is selected on client end, you can change it to ‘TLS 1.1’ and/or other TLS 1.0 on FortiGate end, and it is done. Check if the issue is resolved.



Method 2: Reinstall Miniport Driver

You can also try to fix the issue by reinstalling Miniport driver in computer.

Step 1: Open ‘Device Manager’ app in Windows PC via Windows Search Box and click ‘View’ menu and select ‘Show Hidden Devices’

Step 2: Now, expand ‘Network Adapters’ category, there should be series of WAN Miniport driver: IP, IPv6, PPTP, IKEv2, etc. If Miniport driver is not visible, you will have to reinstalled.

Step 3: Open your browser and visit Microsoft Official website, search for ‘devcon.exe’ and download & install this file in computer

Step 4: You can find the different miniport driver version name relating to your OS in “C:\Windows\inf\netrasa.inf”. Depending on Windows OS version, this path will be different.

Step 5: Now, press ‘Windows + R’ keys on keyboard, type ‘cmd’ in ‘Run’ window and press ‘CTRL + SHIFT + ENTER’ keys on keyboard to open ‘Command Prompt as Administrator’

Step 6: Type the following commands and hit ‘Enter’ key after each to execute.

Step 7: Once executed, restart your computer and check if the issue is resolved.