Windows 10: Transferring files to NAS virtually halts with Windows Defender Real Time Protection turned on

Recently I started experiencing issues with transferring files from my Windows 10 laptop (Win version 1903) to a Synology NAS. On a regular basis, I need to transfer around 1 GB to the NAS. When I try to do that now, the transfer speed will go down to zero after 2 seconds and after that transfer speed will go up again occasionally only to go back to zero again. It now takes me around 15 minutes to transfer 1 GB on a 1Gb ethernet connection, instead of the usual 10 seconds. When I download the same files again to my laptop there are no problems, so it's only uploading that is slow.


After some experimenting with SMB settings (to no avail) and other clients (a mac client had no issues) I could narrow the issue down to the Real Time Protection of Windows Defender. When I turned this off, uploading files to the NAS were back to normal.


I find it strange that only uploading is affected by Windows Defender (If any, I would assume Windows Defender would slow down downloads for scanning purposes), and I know you can exclude the network destination from being scanned by Windows Defender. But I don't see a valid reason why I would need to exclude the network destination to successfully transfer some files from my laptop to that destination.


I guess this is more a bug report than a question, but I cannot find a proper place to report a Windows Defender bug.


Cheers,

Ronald

:)

 

Unable to turn on Windows Defender real time protection


Hi guys, I'm a bit desperate here right now. *Confused

I have the same problem that this guy over here. I'm running Windows 10 Home x64, version 1607, build 14393.0.

I had to restore the PC to a previous point because I ****ed up some drivers. Then my AV (Bitdefender Free) started having some issues (they gui didn't display correctly) so I decided to uninstall it and just go with Windows Defender.

The problem is I can't get it to work... I get a notification in the Action Center saying to turn on the virus protection, when I click it, Windows Defender goes green(PC status: protected, Real time protection: on) for a second and then goes yellow again (PC status: Windows Defender is OFF, Real time protection: Handled by another AV program) and I get the notification again. If instead of clicking the notification I click "Turn on" on the Windows Defender gui, Windows opens another window, "Apps & Features" in settings, like asking me to uninstall the other, nonexistent AV.

Now, I've tried a lot of things...

• Of course, I have completely uninstalled Bitdefender. I used the official tool provided by them for this. There is nothing in the registry by bitdefender nor any file or folder by that name in my PC.

• I have tried every step listed here.

• I have tried to install another AV (Avast) and the uninstall it to see if this would "reset" somehow windows defender. (Nope.)

• I have tried option #2 here Windows Defender - Turn On or Off in Windows 10 - Windows 10 Forums

• I have run MBAM and nothing pops-up

In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender there is noDisableAntiSpyware key. But in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender there is a DisableAntiSpyware key and its value is 0. (Not sure if this is important but wanted to give you the info.)

Anyone has any idea? Right now I'm thinking of downloading another AV or just go without any and be done with it. *Huh

 

Windows Defender Real-time Protection will not turn on

I've done the exact same steps and same for me. Still won't turn on. Anyone have a way to muscle defender into turning on real-time protection?

 

I can't turn on Windows Defender Real Time Protection

We appreciate your response. We suggest that you try to turn on Windows Defender Real Time Protection from a Hidden Administrator account. To enable Hidden Administrator, the following are the steps:

• Right-click on the Start button and select Command Prompt (Admin).
• In the command prompt, type in net user administrator /active:yes and press Enter.
• Log out and log back in using the Administrator account.

Let us know if you require further assistance.