Got a mystifying issue with my WiFi. It suddenly stopped working and after much trial and error I got it work by lowering the MTU to 316.
netsh interface ipv4 set subinterface "Wi-Fi" mtu=316
Anything higher than that just hangs and end up with a ERR_CONNECTION_CLOSED error.
How the issue started
- I was uploading a big file to the cloud from WSL and then the internet suddenly stopped working permanently. Not only in WSL but also in Windows.
- Then I connected to the guest WiFi in the same router (it's a Google Wifi) and it worked fine for weeks. But then one day I uploaded another big file from WSL the same way as before and the guest WiFi stopped working permanently too. The first time I though it was a coincidence, but twice...
What I have tried
- Tried using a WiFi USB adapter, and it has the same issue. So this rules out hardware/driver problems.
- It works fine (mtu=1500) if I connect my phone to the Google Wifi and create a WiFi hotspot, and connect the computer to that WiFi hotspot (basically using the phone to forward the connection), so the issue only happens when I connect directly to that WiFi network.
- There are other computers and devices in the same WiFi network and they work fine.
- Tried factory reset the router, changing the password of the WiFi, changing the ssid of the WiFi, changing the name of the computer, using a random MAC address (just in case the AI in Google Wifi was doing something funny with this computer for some reason).
- Tried using a VPN.
- Tried shutdown WSL, and also uninstalled it completely, because why not.
- Tried everything on this page, including "Network Reset". Also tried deleting WiFi network profiles
netsh wlan delete profile name=*.
I ran out of ideas of what to try, besides reinstalling Windows from scratch. Also I can't really 100% rule out if the problem is in Windows or in the Google Wifi router, though I'm leaning towards a Windows issue.
Any suggestions?
