Solved.
Kudos0

High DPC latency caused by ndis.sys with Norton Security in Windows 11

Hi, everyone,

since upgrading to Windows 11, I experience massive problems with high DPC latency caused by the ndis.sys driver. This generates massive spikes of up to over 300ms in LatencyMon when surfing with Edge and Firefox. Windows 11 often creates a micro stutter/freeze in this moment, with the mouse pointer and sound stopping for a very short time.
 

The error is particularly evident when loading complex websites with many advertising banner elements that are apparently scanned by Norton. Example: www.pcgameshardware.de. But even if an adblocker is running, the error can occur.
 

If I uninstall Norton Security and only use Windows Defender, I cannot reproduce the DPC Latency Spikes. It is expressly not enough to simply deactivate the real-time or manipulation protection. Reinstalling Norton Security didn't change anything. Only the complete uninstallation helps.
 

Windows 11 and Norton Security have the current patch status. All drivers, including the Intel I219-V network chip and the BIOS of the Z370 mainboard with Intel i7-8700K are updated. On Windows 10 I could not detect these micro freezes, also on a similar machine with Norton Security. It makes no difference whether CPU power saving settings are disabled or enabled.

I suspect Norton is interfering with the ndis.sys driver and causing the DPC latency spikes. TPM may also play a role under Windows 11.

Please escalate to development. Thank you!

Accepted Solution
Kudos0

Re: High DPC latency caused by ndis.sys with Norton Security in Windows 11

The file ndis.sys is related to network drivers. It CAN be the source of other issues such as video and sound as well. IF, you are running a version of Windows 11 that is an insider build, or on an unsupported device. That would most likely be your issue. Running a VPN can also cause the issue. FWIW!! Norton doesn't guarantee their products will correctly function with insider builds as such. Do you have any screenshots available from your system event viewer that shows the faulting driver/software as being Norton? If so please post so we can review with you. 

SA

Replies

Kudos0

Re: High DPC latency caused by ndis.sys with Norton Security in Windows 11

Hello Merkor. Please review the following Microsoft article for a possible resolution. Check/change your power plan and ensure your video and other drivers for Windows 11 are updated and supported by the OS.

https://answers.microsoft.com/en-us/windows/forum/all/ndissys-causing-hi...

SA

MS Certified Professional / Windows 11 Home 22H2 x 64 build 22621.1265 - Windows 10 Pro x 64 version 22H2 / build 19045.2728 / Norton Security Ultra - Norton 360 Deluxe ver. 22.23.1.21 / Opera GX LVL4 (core: 96.0.4693.104) 64 bit-Early Access w/Norton Chrome Extensions
Kudos0

Re: High DPC latency caused by ndis.sys with Norton Security in Windows 11

All drivers are up to date. Changing the power plan and energy settings of the Intel ethernet chipset make no difference. It seems to be Norton and/or Windows 11.
Accepted Solution
Kudos0

Re: High DPC latency caused by ndis.sys with Norton Security in Windows 11

The file ndis.sys is related to network drivers. It CAN be the source of other issues such as video and sound as well. IF, you are running a version of Windows 11 that is an insider build, or on an unsupported device. That would most likely be your issue. Running a VPN can also cause the issue. FWIW!! Norton doesn't guarantee their products will correctly function with insider builds as such. Do you have any screenshots available from your system event viewer that shows the faulting driver/software as being Norton? If so please post so we can review with you. 

SA

MS Certified Professional / Windows 11 Home 22H2 x 64 build 22621.1265 - Windows 10 Pro x 64 version 22H2 / build 19045.2728 / Norton Security Ultra - Norton 360 Deluxe ver. 22.23.1.21 / Opera GX LVL4 (core: 96.0.4693.104) 64 bit-Early Access w/Norton Chrome Extensions

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