Netgear Nighthawk 5ghz WiFi not uploading files

[NutgearsGrindin]

I have seen multiple threads about CAX80 Netgear Nighthawk not allowing people to upload files on 5g WiFi, I am also having this problem. I recently “upgraded” my modem to this device. I am only able to upload files on 2.4g. If I turn on my VPN, then I am able to upload on 5g. I can’t just run on 2.4g because the speed is awfully slow and downloading files takes a bit of time. I handle about 50 files a day downloading, then uploading. Switching back and forth is not productive at all.

Does anyone have a solution to this issue?

[FURRYe38]

What FW is loaded on the CAX80? 

v5.x is most current version and is supposed to resolve that I believe. 

What ISP is the CAX80 connected too? 

What wifi devices are connected to 5Ghz? Brand and model#.

Is Smart Connect enabled? 

What channels are you using for 5Ghz? 

Is MIMO enabled? 

Does problem happen if you diable AX mode on 5Ghz? 

[NutgearsGrindin]

What FW is loaded on the CAX80?      Unsure where to find this info.

v5.x is most current version and is supposed to resolve that I believe.     I have the most recent firmware 5.1.1.8

What ISP is the CAX80 connected too?      Xfinity

What wifi devices are connected to 5Ghz? Brand and model#.     iMac 2023 Apple M3

Is Smart Connect enabled?       No

What channels are you using for 5Ghz?     Channel 36

Is MIMO enabled?       Unsure where to find this info.

Does problem happen if you diable AX mode on 5Ghz?      Yes

[NutgearsGrindin]

Netgear AX6000 firmware:

Model name: CAX80

Standard: DOCSIS 3.1

Wi-Fi technology: Wi-Fi 6 

[FURRYe38]

Can you try with Smart connect enabled? 

Try diabling AX mode under Basic tab/Wireless settings/AX Check box for 5Ghz .

[NutgearsGrindin]

Neither one of those options worked. I’m assuming it has something to do with a security setting. When I turn on my Norton VPN I am able to upload files anywhere. The only issue with leaving that on is that some websites that I use need to verify my location. 

[FURRYe38]

What security mode are you using? WPA2 only or mixed WPA2 and WPA3?

[NutgearsGrindin]

WPA2 only

[FURRYe38]

Is this the only device that does this?

[NutgearsGrindin]

It does it on all devices. Laptops, iMacs, iPads, and iPhones.

[FURRYe38]

What DNS are you using on the CAX80? ISP auto detected DNS or a custom DNS service? 

Is IPv6 enabled and if so, using ISP auto detected IPv6 DNS or a custome IPv6 DNS service?

[jgyeuc]

I'm having exact same problem for few months and couldn't found any solution. 

Firmware is up to date but still can't send or upload photos through 5Ghz.

[Atomized]

I was having the same problem on both my 2015 MacBook Pro and my 2022 Mac Studio M1 Max. On both devices, upload speed tests indicated fast speeds, and uploading files via gmail was fast. The issue was happening with file attachments on both Slack and Apple Mail on both devices. Anything over ~80kb would fail.

As to FURRYe38's questions:

What FW is loaded on the CAX80? V5.1.1.8

What ISP is the CAX80 connected too? Xfinity

What wifi devices are connected to 5Ghz? Brand and model#. See above

Is Smart Connect enabled? Yes

What channels are you using for 5Ghz? 36 (P) + 40 + 44 + 48 + 52 + 56 + 60 + 64

Is MIMO enabled? Yes

Does problem happen if you disable AX mode on 5Ghz?  NO

In short, I had AX mode enabled; turning it off fixed the problem for me. I included the other info in case it helps someone else.

Thanks FURRYe38!

[NutgearsGrindin]

MIMO - Enabled

ISP auto detected DNS or a custom DNS service? Auto from ISP

Is IPv6 enabled and if so, using ISP auto detected IPv6 DNS or a custome IPv6 DNS service? Enabled - Auto ISP

[NutgearsGrindin]

Thank you for adding this information. I hope it is helpful for anyone having this issue. I set everything the same as yours and still have this issue.

[FURRYe38]

MIMO - Enabled ISP auto detected DNS or a custom DNS service? Auto from ISP

Try setting a IPv4 DNS service like Cloudfare or Quad9.

Is IPv6 enabled and if so, using ISP auto detected IPv6 DNS or a custome IPv6 DNS service? Enabled - Auto ISP

Try setting a IPv6 DNS service like Cloudfare or Quad9.

Then try disabling IPv6 entirely. 

[Atomized]

UPDATE: Unfortunately, disabling AX mode only worked temporarily. As of this morning, Slack and Mail file attachments are failing to upload again. 🙁

[FURRYe38]

@Atomized @NutgearsGrindin 

Could I get you two to enable debug logging on the gateways debug web page at router IP address/debug.htm. Enable WAN/LAN capture and well then start logging. Then reproduce the 5Ghz wireless uploading of files issue. After that's reproduced, select Save Logs.

After logs have been saved, place the .zip file up on a cloud service and PM the link to this file so I can get this over to NG for review. 

[Atomized]

I appreciate your efforts, but unfortunately I had the same result as the person who replied to you in this Reddit thread: I clicked the "Save Debug Log" button and the page just never resolved and nothing was downloaded. I gave it about five minutes, after which I had to power off the router because I couldn't even return to the settings pages. Upon rebooting, I was forced to go through the new password / security questions setup again.

I opened a case since I'm still under warranty. I'll update here if anything comes of it. 

[FURRYe38]

What browser were you using? I use MS Edge and have been able to get logs from my CAX80. 

Might clear out browser caches before doing to the debug page as well. 

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@Atomized wrote:

I appreciate your efforts, but unfortunately I had the same result as the person who replied to you in this Reddit thread: I clicked the "Save Debug Log" button and the page just never resolved and nothing was downloaded. I gave it about five minutes, after which I had to power off the router because I couldn't even return to the settings pages. Upon rebooting, I was forced to go through the new password / security questions setup again.

I opened a case since I'm still under warranty. I'll update here if anything comes of it. 

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[Atomized]

@FURRYe38 I'm using Arc (which is chromium-based like MS Edge, if you're unfamiliar with it). I'm under the gun on a project at the moment, but I'll try clearing the cache / using another browser when I'm free.

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@FURRYe38 wrote:

What browser were you using? I use MS Edge and have been able to get logs from my CAX80. 

Might clear out browser caches before doing to the debug page as well. 

[FURRYe38]

Please try MS Edge actual and FireFox browsers.

[Atomized]

@FURRYe38 

I tried both Edge and Firefox with cleared caches and unfortunately the page still hangs, forcing me to unplug the CAX80 to get back to the settings. 

[FURRYe38]

Any progress on this? 

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@NutgearsGrindin wrote:
I have seen multiple threads about CAX80 Netgear Nighthawk not allowing people to upload files on 5g WiFi, I am also having this problem. I recently “upgraded” my modem to this device. I am only able to upload files on 2.4g. If I turn on my VPN, then I am able to upload on 5g. I can’t just run on 2.4g because the speed is awfully slow and downloading files takes a bit of time. I handle about 50 files a day downloading, then uploading. Switching back and forth is not productive at all.

Does anyone have a solution to this issue?

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