Forticlient VPN BSOD

[BigSG]

Hi,

Ever since the Microsoft update issue of April 2025 we have been encountering BSOD issues.

All the fixes and updates are in place but we now find that Windows 11 24H2 with the Forticlient free VPN installed are still experiencing the BSOD. 24H2 machines without the vpn are ok. Uninstalling/re-installing the vpn from problem machines makes no difference. BSOD debug show NetIO.sys is at fault. Latest and previous versions of the vpn have been tried and all drivers updated.

Anyone else seeing this issue or have advice to resolve this?

[Jean-Philippe_P]

Hello BigSG, 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

Thanks, 

[Jean-Philippe_P]

Hello,

We are still looking for an answer to your question.

We will come back to you ASAP.

Thanks,

[Jean-Philippe_P]

Hello!

I found this solution. Can you tell me if it helps, please?

Based on the information provided, it seems that the BSOD issue is related to the FortiClient VPN interacting with the network drivers on Windows 11 24H2. Here are some steps you can take to try and resolve the issue:

1. Check for Conflicting Software: Ensure that there are no other VPN clients or network-related software that might be conflicting with FortiClient. Uninstall any unnecessary software.
   
   
2. Network Driver Update: Since the BSOD debug points to `netio.sys`, ensure that all network drivers are up to date. If they are already updated, consider rolling back to a previous stable version.
   
   
3. FortiClient Configuration: Review the FortiClient VPN configuration settings. Ensure that the settings are compatible with your network environment.
   
   
4. Windows Update: Ensure that all Windows updates are installed, as Microsoft may have released patches to address compatibility issues.
   
   
5. FortiClient Logs: Check the FortiClient logs for any errors or warnings that might provide more insight into the issue.
   
   
6. Contact Support: If the issue persists, consider reaching out to Fortinet support for further assistance. Provide them with the BSOD logs and any relevant information.
   
   
7. Alternative VPN Solutions: As a temporary workaround, consider using an alternative VPN solution to see if the issue persists.

If none of these steps resolve the issue, it may require a more in-depth investigation by Fortinet support or Microsoft to identify the root cause.