Network reset → speed test: 100mbps download
Use VPN, disconnect VPN → speed test: 1mbps download
Happened to surface pros, happening now to laptops… i can only assume some windows update is breaking this.
any ideas? our company doesn’t have network engineer
Issue is due to microsoft RCS. Disable it. This kb should help:
Edit: posted better kb with better information
Are you using 6th generation SonicWall, firmware version 6.x? If so, it’s known to be SUPER slow. They say that version 7.x is MUCH BETTER. But you’ll have to buy one to find out!
Follow the ‘Steps to disable RSC manually’.
Open an Admin Command Prompt window:
Start > All Apps > Windows System → Right-click “Command Prompt” > More > Run as administrator
Get your network adapter name:
powershell Get-NetAdapter
Note your adapter’s name (Example: Wi-Fi)
Get your network adapter “Receive segment coalescing” (Rsc) settings:
powershell Get-NetAdapterRsc
Disable Rsc for your network adapter:
powershell Disable-NetAdapterRsc -Name ADAPTER_NAME_FROM_BEFORE
… Be sure to replace ADAPTER_NAME_FROM_BEFORE with whatever your network adapter name is, without quotes
Verify Rsc is disabled for ipv4 and ipv6, on your network adapter:
powershell Get-NetAdapterRsc
… Should now show IPv4Enabled False, and IPv6Enabled False, for your network adapter
Re-test your wireless internet connection.
holy shit thanks i’ll try after lunch
Wow. Thank you so much for posting this. I’ve been having this problem for quite some time and I just assumed that split tunnel wasn’t working.
No problem, theres a bunch of extra stuff in the kb but i replied again with the steps from the kb youll need to do. This will most likely resolve this issue.
he saved me as well. nice
Ayee no problem. Glad to help!
i haven’t tried yet but i wanted to ask - was it a certain windows update that broke this? or is this SonicWall’s fault?
Sorry, found a better kb. This is an issue with microsoft, Sonicwall is providing a work around for it:
Oh, so should I use this article instead of the one you linked before? Even though that one was more up to date?
e: or am I supposed to follow both articles?
Yup, id use this one. Instructions are the same pretty much.
Any idea what they mean by this: New patch files of Windows 10 have been released which take care of the issue hence either you may upgrade the windows operating system to the latest patch available
On the article you linked.
On the PCs I’m having issues with, I have KB5014699 which are the latest W10 release I can get, but looks like there’s KB5016139 released 2 days ago. Would this patch also fix the issue?
I’m not 100% sure. I would upgrade win 10 to latest regardless. If updated to latest windows and still issue is present, def go for disabling RSC. I’ve done it many times.
nice… tried on a laptop and it worked!
any idea if we’ll have to eventually re-enable rsc in the future? or does this really not have other effects we can leave it as it is forever?
I’ve left it disabled and havent had any issues! Id looking deeper into RSC but from my end no issues since. Glad it helped!
We have been disabling this for a while and wrote a script to auto push to new machines. Have not had any issues disabling it. Most cyber insurance companies are wanting MFA for any VPN access now, which is not possible with the global VPN client, so we are moving clients to the SSLVPN instead to support that which has no issues with RSC being on