u/Ricky_Loops

I have been doing some undervolt testing on my pc. Once the test was finished i reinstalled win 11. One of my test for stability is windows defender full scan. And now i start noticing windows defender scan notifications (no new threats ware found). Is missing on my windows/stopped working

I reinstalled windows 11 multiple time. Even tried installing an older build which had local account support. And scanned system without connecting internet. Still no notifications

I have done some intense troubleshooting

But no notifications.

My post, https://techcommunity.microsoft.com/discussions/windows11/windows-defender-notifications-not-working-—-even-after-clean-installs-bios-rese/4512944

https://learn.microsoft.com/en-us/answers/questions/5864084/windows-defender-notifications-not-working-even-af

Its super wired. But recently i been doing a lot of undervolt and been using some apps. And once i was stable i remove apps and clean install windows.

I have been having Defender service stop issue prior to that due to undervolt, but this time everything else is working but Defender notification. like everything time a scan fonish or threat found stopped working.

So i celan install windows one more time this time using win media Creation tool same observation no notification i thought it was due to latest Defender undate or security update so i download a older version win 11 23h2 istalled offline no internet and tested it. Same behavior no notification.

I cleared Bios cmos. And revoked undervolt. Verified the defender notification settings, GPO, Registery, services like push notification etc and still no result. Can any one know why this is happening

The software i used are : pawnio, smudebugtool, aida64, cinebench r23, corecycler, occt, Y Cruncher. Hwinfo64

Hi everyone,

I’m running a Ryzen 9 9950X3D on an Asus X870E Hero and I’ve run into a weird stability issue.

The Setup:

I have a Curve Optimizer undervolt applied (CCD0: -25, CCD1: -23, +50MHz boost). It passed 2 hours of AIDA64 and multiple Cinebench R23 runs, so I thought it was 100% stable.

The Problem:

My system crashes the Windows Defender service (MsMpEng.exe) every time I run a scan. The Event Viewer shows an 0xc0000005 (Access Violation) error.

If I reset my BIOS to stock settings, the crashes stop immediately. I’ve already ruled out a virus with a third-party scanner, so it’s definitely linked to my undervolt.

Event viewer error:

Faulting application name: MsMpEng.exe,

version: 4.18.26030.3011,

time stamp: 0xeaa752c1

Faulting module name: mpengine.dll,

version: 1.1.26030.3008,

time stamp: 0x62b9c1ff

Exception code: 0xc0000005

Fault offset: 0x000000000003b9f4

Faulting process id: 0x1468

Faulting application start time: 0x1DCCEB3B73C8E35

Faulting application path: C:\\ProgramData\\Microsoft\\Windows Defender\\Platform\\4.18.26030.3011-0\\MsMpEng.exe

Faulting module path: C:\\ProgramData\\Microsoft\\Windows Defender\\Definition Updates\\{4BFEA7C0-6C91-40D8-8B29-774F817B00D7}\\mpengine.dll

Report Id: c1c0a950-3842-499d-b284-29b2a36d03b3

Faulting package full name:

Faulting package-relative application ID:

My Questions:

Is it common for a system to pass heavy stress tests like Cinebench but fail at simple tasks like an AV scan?

Has anyone else experienced Windows Defender being more sensitive to unstable undervolts than traditional stress tests?

Any advice on which part of the undervolt I should back off first to fix this? Thanks!

Hi everyone,

I’m running a Ryzen 9 9950X3D on an Asus X870E Hero and I’ve run into a weird stability issue.

The Setup:

I have a Curve Optimizer undervolt applied (CCD0: -25, CCD1: -23, +50MHz boost). It passed 2 hours of AIDA64 and multiple Cinebench R23 runs, so I thought it was 100% stable.

The Problem:

My system crashes the Windows Defender service (MsMpEng.exe) every time I run a scan. The Event Viewer shows an 0xc0000005 (Access Violation) error.

If I reset my BIOS to stock settings, the crashes stop immediately. I’ve already ruled out a virus with a third-party scanner, so it’s definitely linked to my undervolt.

My Questions:

Is it common for a system to pass heavy stress tests like Cinebench but fail at simple tasks like an AV scan?

Has anyone else experienced Windows Defender being more sensitive to unstable undervolts than traditional stress tests?

Any advice on which part of the undervolt I should back off first to fix this? ThanksHi everyone,

I’m running a Ryzen 9 9950X3D on an Asus X870E Hero and I’ve run into a weird stability issue.

The Setup:

I have a Curve Optimizer undervolt applied (CCD0: -25, CCD1: -23, +50MHz boost). It passed 2 hours of AIDA64 and multiple Cinebench R23 runs, so I thought it was 100% stable.

The Problem:

My system crashes the Windows Defender service (MsMpEng.exe) every time I run a scan. The Event Viewer shows an 0xc0000005 (Access Violation) error.

If I reset my BIOS to stock settings, the crashes stop immediately. I’ve already ruled out a virus with a third-party scanner, so it’s definitely linked to my undervolt.

Event viewer error:

Faulting application name: MsMpEng.exe,

version: 4.18.26030.3011,

time stamp: 0xeaa752c1

Faulting module name: mpengine.dll,

version: 1.1.26030.3008,

time stamp: 0x62b9c1ff

Exception code: 0xc0000005

Fault offset: 0x000000000003b9f4

Faulting process id: 0x1468

Faulting application start time: 0x1DCCEB3B73C8E35

Faulting application path: C:\\ProgramData\\Microsoft\\Windows Defender\\Platform\\4.18.26030.3011-0\\MsMpEng.exe

Faulting module path: C:\\ProgramData\\Microsoft\\Windows Defender\\Definition Updates\\{4BFEA7C0-6C91-40D8-8B29-774F817B00D7}\\mpengine.dll

Report Id: c1c0a950-3842-499d-b284-29b2a36d03b3

Faulting package full name:

Faulting package-relative application ID:

My Questions:

Is it common for a system to pass heavy stress tests like Cinebench but fail at simple tasks like an AV scan?

Has anyone else experienced Windows Defender being more sensitive to unstable undervolts than traditional stress tests?

Any advice on which part of the undervolt I should back off first to fix this? Thanks!

Hi everyone,

I’m running a Ryzen 9 9950X3D on an Asus X870E Hero and I’ve run into a weird stability issue.

The Setup:

I have a Curve Optimizer undervolt applied (CCD0: -25, CCD1: -23, +50MHz boost). It passed 2 hours of AIDA64 and multiple Cinebench R23 runs, so I thought it was 100% stable.

The Problem:

My system crashes the Windows Defender service (MsMpEng.exe) every time I run a scan. The Event Viewer shows an 0xc0000005 (Access Violation) error.

If I reset my BIOS to stock settings, the crashes stop immediately. I’ve already ruled out a virus with a third-party scanner, so it’s definitely linked to my undervolt.

Event viewer error:

Faulting application name: MsMpEng.exe,

version: 4.18.26030.3011,

time stamp: 0xeaa752c1

Faulting module name: mpengine.dll,

version: 1.1.26030.3008,

time stamp: 0x62b9c1ff

Exception code: 0xc0000005

Fault offset: 0x000000000003b9f4

Faulting process id: 0x1468

Faulting application start time: 0x1DCCEB3B73C8E35

Faulting application path: C:\ProgramData\Microsoft\Windows Defender\Platform\4.18.26030.3011-0\MsMpEng.exe

Faulting module path: C:\ProgramData\Microsoft\Windows Defender\Definition Updates\{4BFEA7C0-6C91-40D8-8B29-774F817B00D7}\mpengine.dll

Report Id: c1c0a950-3842-499d-b284-29b2a36d03b3

Faulting package full name:

Faulting package-relative application ID:

My Questions:

Is it common for a system to pass heavy stress tests like Cinebench but fail at simple tasks like an AV scan?

Has anyone else experienced Windows Defender being more sensitive to unstable undervolts than traditional stress tests?

Any advice on which part of the undervolt I should back off first to fix this? Thanks!

Hey guys,

We’re hitting a wall with the SharePoint ACS retirement. We have a 10-year-old legacy site collection with multiple subsites. Our data team uses SSIS for automation on one specific subsite, and now that ACS is dead, the automation is failing.

We tried moving to a Registered App with Graph Sites.Selected, but we’re struggling to scope it. It seems Graph really wants to play at the root/Site Collection level.

The hurdles:

No App Passwords: We use a 3rd-party auth provider, so they are disabled tenant-wide.

Granular Access only: Security won't let us grant access to the entire parent/root site; we need to map the app specifically to that subsite's data.

Has anyone successfully mapped Sites.Selected to a subsite specifically, or found a modern workaround for legacy sites that doesn't involve over-provisioning permissions?