Samba Shares to Window 10 throttled by Windows Defender Firewall

I've had my OMV since OMV4 and have always noticed some bottlenecking but when I finally sat down to measure the issue I realized my speeds have gone from ~100MB/s to 10-12MB/s. I've upgraded to OMV5 a month ago and that's really when I noticed the issue. Occasionally when I restart both the NAS and PC my speed comes back. But when I turn off my Private Network Firewall all the speed comes back.

Note this only seems to occur when I'm transferring files from the Win10 PC to the OMV5 smb folders.

I'd love any help, I am very out of my element with this sort of stuff.

Quote from geaves

First of all I would suggest moving to OMV6, V5 is now EOL.

What you are describing and what you are experiencing is a network issue, in a house with all W10 Pro machines and using OMV since V3 I have never ever had to turn off Private Networking on any of my machines.

Some more information on how this is all set up might be a starting point.

Thanks for responding. I definitely plan on moving to OMV6 within the next 6 months, I just got everything moved over to OMV5 and then they announced it was EOL.

This is a weird issue that wasn't there at the start, I keep seeing posts all over the internet in my initial research of this problem that it could have been the real time protection of Windows Defender throttling the speeds, But I don't know enough to do anything. I have no plans on keeping my private network firewall down. I only turned it off the check the speeds and that was when I noticed.

Everything in this problem are hardwired to each other through a switch and a TP-Link DECO. I've replaced all the ethernet between them and have a new network card in my Win10 PC (I did all this when I thought it was a cabling issue)

Hey, I may have just solved it. I used putty to ssh into my machine and ran omv_firstaid to reconfigure my network interface and I'm getting my speeds back again!

Quote from geaves

Since this only occurs when you're transferring to OMV from W10, do you have ClamAV installed on OMV, just a guess here but what you are describing is real-time scanning of files during transfer, this is something that windows defender does not do.

Have you tested your network connection using iperf before you ask yes I've used it a couple of times but even I have to read up on how to use it.

I don't have any antivirus installed on OMV, so I guess real time scanning isn't a thing. But I did have the issue reappear the day after I thought the issues were resolved. I ran iperf3 and

[  4] local 192.168.xxx.xxx port 52232 connected to 192.168.xxx.xxx port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec   113 MBytes   950 Mbits/sec
[  4]   1.00-2.00   sec   113 MBytes   949 Mbits/sec
[  4]   2.00-3.00   sec   113 MBytes   949 Mbits/sec
[  4]   3.00-4.00   sec   113 MBytes   949 Mbits/sec
[  4]   4.00-5.00   sec   113 MBytes   949 Mbits/sec
[  4]   5.00-6.00   sec   113 MBytes   949 Mbits/sec
[  4]   6.00-7.00   sec   113 MBytes   949 Mbits/sec
[  4]   7.00-8.00   sec   113 MBytes   949 Mbits/sec
[  4]   8.00-9.00   sec   113 MBytes   949 Mbits/sec
[  4]   9.00-10.00  sec   113 MBytes   949 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  1.11 GBytes   949 Mbits/sec                  sender
[  4]   0.00-10.00  sec  1.11 GBytes   949 Mbits/sec                  receiver

iperf Done.

yeah the Deco is just tplink's mesh wifi system.

Latest step. I changed some QOS settings on my router to see if it wasn't prioritizing my NAS or PC and rebooted all systems and my speeds up and down are back. Not sure if it fixed the issue but I'll give it a week.

Don't know if TP-Link's QOS was throttling it or why the speeds came back when I turned off the firewall, or if any of it is connected, but I'll keep updating it. My only thought with the QOS is that in the DECO app you can run a speed test for your QOS and it has my ISP upload speeds in there which are around 10-16Mbps and thought it would somehow be linked....

Been more than a month after changing the QOS on my Deco mesh network interface and have had no issues with speed. Crazy how it throttles even my wired devices.