How to Fix Forticlient Error “Failed to Establish the VPN Connection”?

If you are unable to make the connection as VPN Client when you trying to connect to VPN (Virtual Private Network) Network using FortiClient, and connection getting stuck at Status: 98% result in, disconnected, then you are in right place for the solution. This problem occurs usually due to some problems with your Windows Operating System WAN Miniport Driver, and “Forticlient Error” appears on Forticlient version as well as running on Windows 10/8 operating System.

“Forticlient”: It is an integrated endpoint protection platform offers automated next-gen threat protection, control and visibility of your software and hardware inventory across entire security fabric. “Forticlient” offers simplified Endpoint management, endpoint visibility & compliance throughout security fabric, helps to prevent known bugs or errors from being exploited by Attackers and automated behaviors based protection against unknown threats. Fortinet’s FortiClient tested a 100% block rate of exploits effectiveness in detecting malware across multiple vectors including email, web, and USB for offline threats.

“Forticlient” – VPN application offers two options including SSL and IPSec to use this VPN application. SSL is recommended option and it is more reliable, and likely to work in all scenarios compared with IPSec, which may not work from some networks including hotels and cafes. Note that configuring SSL VPN connection is required to connect to VPN network using Forticlient.

In case if are facing any problem while connecting once you have setup your new VPN connection using Forticlient – VPN application, then check Forticlient VPN connection issues and troubleshooting. When you encountered “Forticlient Error” after when the computer comes out of hibernation, then you can fix this issue by “Restarting your network device”. While in some case, it will automatically attempt to reboot the network device after when computer comes out of hibernation.

“Forticlient Error” or “Forticlient VPN Connection Error” can also occur when you try to connect multiple devices from one “Home Network/Broadband Connection” and then you try to connect the second derive, the first device will automatically be disconnected. So, you are recommended to install FortiClient VPN application and create a SSL VPN Connection to fix.

Some users reported that Forticlient Error appears as “Unable to logon to the server. Your user name or password may not be configured properly for this connection. (-12)” on their Windows Server 19 Datacenter VM on Azure, after correctly logged into their FortiClient-VPN software with all other settings properly configured.  After that they have tried to connect to VPN network with other user accounts with valid passwords, but they still faced the same issue.

Some common Forticlient Error reported by FortiClient users based Windows 10:

  • Applies to both SSL and IPSec: “Warning: unable to establish the VPN connection. The VPN server may be unreachable (-14)”
  • Applies to “SSL”: “Warning : unable to establish the VPN connection. The VPN server may be unreachable”
  • Applies to SSL: “Failed to establish the VPN connection. This may be caused by a mismatch in the TLS version. Please check the TLS version settings in the Advanced of the Internet options. (-5029)”
  • Applies to IPSec: “Error: Wrong Credentials”
  • Applies to IPSec: The connection fails with no message
  • Applies to IPSec: “Error: Unable to reach tunnel gateway/policy server”

Some common Forticlient Errors with description:

The VPN server may be unreachable (-20199): This error is appeared usually when you try to connect to SSL-VPN. If you are facing this error, then you can try to fix the issue by downloading WAN Miniport repair tool according to your Windows versions by opening  Or page in browser. Once downloaded, run the WAN Miniport Repair Tool and then restart your computer and test VPN access again.

VPN server may be unreachable (-8): It is also known errors among Forticlient users where they faced this error whenever they tried to access VPN service. If you are facing the same and looking for ways to fix, then you can follow our instructions given here in the post and check if it works for you.

Fortinet client on MacBook drops out with -113 error: No only Windows users, MacOS users also reported about Forticlient issue and explained they experienced -113 error while using VPN service on their MacBook. One possible reason the issue can be the outdated VPN Client and MacOS. You can fix the issue by updating MacOS and Forticlient VPN to latest & compatible version and then check if it works for you.

Error in FortiClient SSL VPN using FortiAuthenticator ‘unable to logon to server username or password might not be configured properly (-12)’: This error is another error belongs to Forticlient VPN service. This error is usually appeared when you try to login into FortiClient SSL VPN. In order to fix the issue, you should make sure the group name defined in FortiGate matches Radius Attribute Value in the FortiAuthenticator user group. Note down the group name and in Radius Attributes Fortinet group name, the value is ‘sslvpn’ and similarly, define group name as ‘sslvpn’ in Fortigate as well under ‘User & Authentication > User Groups’.

How to Fix Forticlient Error “Failed to establish the VPN Connection”?

This issue can occur due to TLS mismatch.

Step 1: Open “Internet Explorer” browser in your Windows 10 device

Step 2: In the opened “IE” browser, go to “Settings > Internet Options > Advanced” and scroll down to check “TLS Version”

Step 3: If “TLS 1.2” version is selected on client end, then you need to change to TLS 1.1 and/or TLS 1.0 on FortGate end.

How to Fix WAN Miniport, VPN, Dial-up Error Code 720 and similar errors?

Step 1: At first, you need to install “WAN Miniport Repair Tool”

Step 2: Reboot your computer

Step 3: Now, run “WAN Miniport Repair Tool” and then restart your computer to save the changes

Step 4: After restart, test VPN access.

Reinstall Miniport Driver to fix Forticlient Error

Step 1: Press “Windows + X” keys together from keyboard and select “Device Manager”

Step 2: In the opened “Device Manager” window, click on “View > Show hidden Devices”

Step 3: Under “Network Adapters” category, there should be series of WAN Miniport: IP, IPv6, PPTP, IKEv2, etc. In case if the Miniports are not visible, then you will have to reinstalled.

Step 4: To download Miniport driver, visit Microsoft official site, search for “devcon.exe” and download and then install this file in your computer.

Step 5: Once done, you can find the different miniport driver names associated with your OS in “C:\Windows\inf\netrasa.inf”. Depending on Windows OS version, this path will be different.

Step 6: Perform reinstall Miniports operation using “Command Prompt”. To do so, press “Windows + X” keys together from keyboard and select “Command Prompt as admin”

Step 7: Now, type the following commands in command line and hit “Enter” keys after each to execute.

Step 8: After that, restart your computer.

Step 9: Similarly, you will need to reinstall your VPN Client software or hardware driver to fix Forticlient Error

To make VPN Client work with Windows 8.x/Windows 10, execute following commands

Step 1: Open “Command Prompt as admin”

Step 2: Type the follow command one-by-one and hit “Enter” key after each to execute

“netcfg –v ms_ndiswanip”

“netcfg –v ms_ndiswanipv6”

Step 3: After that, restart your computer. Windows will detect the devices are missing and reinstall it automatically

Check if “Telephony”, “Remote Access Connection Manager”, “Secure Socket Tunneling Protocol Service” services are running:

Step 1: Press “Windows + R” keys together from keyboard to open “Run Dialog Box”

Step 2: In the opened “Run Dialog Box”, type “services.msc” and hit “Enter” key to open “Services” window.

Step 3: Now, locate “Telephony”, “Remote Access Connection Manager”, “Secure Socket Tunneling Protocol Service” services in opened “Services” window one-by-one, double-click on them and check under “status” section, is started.

Step 4: If not, then click on “Start” button under “Service Status” section to start the service

Update Forticlient – VPN application to version 5.6 to fix Forticlient Error

Forticlient Error occurs due to problem with WAN Miniport driver, causing 98% error message and VPN connection getting stuck at status 98% for some reasons. However, the latest version of Forticlient i.e., Forticlient 5.6 has released with this bug fixes. So, you can’t download/install this new version from Forticlient official site. Before install, make sure the previous/current version of Forticlient has uninstall.

Download or reinstall Miniport Driver update in Windows 10/11 [Automatically]

You can also try to update all Windows drivers including Miniport Driver driver update using Automatic Driver Update Tool. You can get this tool through button/link below.

⇓ Get Automatic Driver Update Tool


I am sure this article helped you to fix Forticlient Error with several easy methods/steps. You can read & flow our instructions to do so. If this article really helped you, then you can share this article with others to help them. That’s all. For any suggestions or queries, please write on comment box below.

People also asked for:

Q: What is error in Forticlient VPN?

A: This Forticlient error happens when there is either: an incorrect configuration setting in the FortiClient desktop app. a network device (home router or ISP) blocking the configuration.

Q: How do I set up Forticlient VPN on Windows 10?

A: Forticlient Error “Failed to Establish the VPN Connection” error can be occurred if Forticlient VPN is not configured properly in Windows 10. You can set up Forticlient VPN on Windows 10 properly in order to fix.

To set up & configure Forticlient SSL VPN Connection on Windows 10:

Step 1: On the Remote Access tab, click Configure VPN.

Step 2: Select SSL-VPN, then configure the following settings: Connection Name. Enter a name for the connection. Description. (Optional) Enter a description for the connection. Remote Gateway. …

Step 3: Click Save to save the VPN connection.

Q: How do I reset my Forticlient VPN?

A: One possible way to fix the issue with Forticlient VPN in your device is to perform Forticlient VPN reset/restart and then check if it works for you. To do so, follow steps below.

Step 1: Go to System Settings > Dashboard.

Step 2: In the Unit Operation widget, click the Restart button.

Step 3: Enter a message for the event log, then click OK to restart the system.

Q: How do I fix Forticlient VPN?

A: If you are facing Forticlient VPN issues like Forticlient Error “Failed to Establish the VPN Connection” or others in your Windows computer, then you can try below solutions to fix and check if it works.

Step 1: Launch Internet Explorer 11, or run inetcpl. cpl .

Step 2: In the Internet Options dialog, select the Security tab.

Step 3: Select Trusted sites.

Step 4: Click the Sites button.

Step 5: Now add the VPN IP address to the list of Trusted sites.

Step 6: Close the Trusted sites dialog.

Step 7: Click OK to apply the changes to Internet Options.


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