I’m facing this issue too. I can’t connect to whatsapp web anymore with Brave, while other browsers (such as Chrome) work perfectly.
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Same problem here. I haved made tests with a clean Brave instalation, it worked, but for some days and after this, the problem cames.
Tests with Secure DNS disabled and clean history don’t worked for me…
Tested in Windows 10 (New Machine and clean OS instalation) and other Windows Devices…
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Yes, this is a real problem…which has not been resolved by the developers after 2 weeks since I created this post. I find it a shame. I have switched to Edge.
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Let’s maintain this topic alive until they resolve this issue or argument any news about this problem. 
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After reviewing several reports re WhatsApp connection troubles:
–
A WhatsApp connection using Brave Browser for desktop and laptop machines, to:
https://web.whatsapp.com/
means that you are also, somehow connecting to FaceBook. In a Brave Browser > New Window, go to: brave://settings/socialBlocking . . . and ‘Allow Facebook logins and embedded posts’.
–
A screenshot created on my iPhone, while I took a look at the WhatsApp app at Apple’s App Store:
That information - indicating that WhatsApp requires you to give up info about you, your computing behavior, and your computing devices - means that there are some Brave Browser settings that might need to be relaxed.
Some users of WhatsApp, have fixed their WhatsApp connection issue, by completely Resetting their Brave Browser > Settings. Ref. to an earlier reply, herein: ‘Whatsapp Web is not working - #15 by Ath3lstan’ (includes a screenshot).
–
Adjust Brave Browser Settings, Clear Cache, Cookies, History, etc., Flush socket pools
You might wish to be more selective, and thus . . .
In a Brave Browser > New Window, go to:
brave://settings/content/siteDetails?site=https%3A%2F%2Fweb.whatsapp.com
There, you might find some settings that are different than, but you can now adjust them to, the default settings for a new Profile:
- Autoplay: Allow
- Ethereum: Ask
- Location: Ask
- Camera: Ask
- Microphone: Ask
- Motion sensors: Block
- Notifications: Ask
- JavaScript: Allow
- Images: Allow
- Pop-ups and redirects: Block
- Ads: Block (Block if site shows intrusive or misleading ads)
- Background sync: Block
- Sound: Automatic
- Automatic downloads: Ask
- MIDI devices: Ask
- USB devices: Ask
- Serial ports: Ask
- File editing: Ask
- HID devices: Ask
- Clipboard: Ask
- Payment handlers: Allow
- Insecure content: Block
- Augumented reality: Ask
- Virtual reality: Ask
- Window placement: Ask
- Fonts: Ask
–
Next, in a Brave Browser > New Window, go to: brave://settings/clearBrowserData
For tab Advanced - set the following two particular items to:
Time range:All time- ENABLE:
Hosted app data
Click on the ‘Clear data’ button.
Return to: brave://settings/clearBrowserData
For tab Advanced - new Profile defaults are set to:
Time range:All time- Enable:
Browsing history - Enable:
Download history - Enable:
Cookies and other site data(Signs you out of most sites) - Enable:
Cached images and files -
DISABLE:
Passwords and other sign-in data(When Enabled DELETES PASSWORDS) -
DISABLE:
Autofill form data -
DISABLE:
Site and Shields Settings(When Enabled DELETES Shields Settings and RESTORES default: Shields UP for site-specific Shields [Lion icon] panel) -
DISABLE:
Hosted app data
Click on the ‘Clear data’ button.
(The ‘Clear data’ button also saves the selections.)
–
Return to: brave://settings/clearBrowserData
In case you wondered . . .
For tab On exit - the new Profile defaults are:
-
DISABLE:
Browsing history -
DISABLE:
Download history -
DISABLE:
Cookies and other site data(Signs you out of most sites) -
DISABLE:
Cached images and files -
DISABLE:
Passwords and other sign-in data(When Enabled DELETES PASSWORDS) -
DISABLE:
Autofill form data -
DISABLE:
Site and Shields Settings(When Enabled DELETES Shields Settings and RESTORES default: Shields UP for site-specific Shields [Lion icon] panel) -
DISABLE:
Hosted app data
–
Next, in a Brave Browser > New Window, go to: brave://settings/security and set:
-
DISABLE:
Always use secure connections(‘HTTPS Only’ toggle switch.) -
DISABLE:
Use secure DNS
–
Next, in a Brave Browser > New Window, go to the Global Shields settings: brave://settings/shields and set:
-
DISABLE:
Auto-redirect AMP pages -
DISABLE:
Prevent sites from fingerprinting me based upon my language preferences.(I have found, that DISABLE is necessary for some websites.)
–
Next, are the new Profile default Global Shields settings for the remaining items. For connecting to WhatsApp, you might temporarily set, to:
- Trackers & ads blocking:
Standard - Upgrade connections to HTTPS: Enable (‘HTTPS Everywhere’ toggle switch)
- Block scripts: DISABLE
- Block fingerprinting:
Standard - Block cookies:
Only cross-site
I say ‘temporarily’, because I favor the ‘Aggressive’ / ‘Strict’ settings, and usually, only relax these settings for difficult Sign-In connections.
–
Cookies check
In a Brave Browser > New Window, go to: brave://settings/cookies and in the upper-right area of the window, enter into the Search field: whatsapp
Then, search down the cookies settings page and check to see if whatsapp shows under Sites that can never use cookies . If exists, then remove the whatsapp entry.
JavaScripts check
In a Brave Browser > New Window, go to: brave://settings/content/javascript and in the upper-right area of the window, enter into the Search field: whatsapp
Then, search down the javascripts settings page and check to see if whatsapp shows under Not allowed to use javascript. If exists, then remove the whatsapp entry.
–
Clearing DNS cache
Option A
In a Brave Browser > New Window, go to brave://net-internals/#dns and click on ‘Clear host cache’
Next, go to: brave://net-internals/#sockets and click on both of the following (in succession):
Close idle socketsFlush socket pools
Exit / Quit Brave Browser
Exit / Quit everything else and Restart your computer.
Option B
How to flush DNS cache in Windows OS: ‘https://www.wikihow.com/Flush-DNS’
How to flush DNS cache in Mac OS: In a Terminal.app window, enter at the prompt:
- dscacheutil -flushcache
–
Notes re what are:
DNS cache:
Socket pool:
‘With pooling, instead of closing a connection after it is used, we can keep it idle while it waits to handle another request. This saves the resources required to create a new connection.’
- Ref. : ‘https://betterprogramming.pub/build-a-tcp-connection-pool-from-scratch-with-go-d7747023fe14’
–
For clarity of what are:
-
HTTPS Everywhere (‘Upgrade connections to HTTPS’ toggle switch at:
brave://settings/shields) -
HTTPS Only (‘Always use secure connections’ toggle switch at:
brave://settings/security)
Ref., see:
–
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The problem is still unresolved by Braff
It is essential
We can go back to Chrome or Firefox and let Brave tean mess around 
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No I’m not using honey extention
yes you are right me switch to opera
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From Firefox: https://old.reddit.com/r/firefox/comments/vg3886/whatsapp_web_not_working_on_firefox_developer/
Ponzi Brave that is all !!
Seems to get WhatsApp working again:
Clicking the Padlock icon worked for me too. After that I only had to click on “Connection is secure” and the problem was solved. No need to make any further selections or changes. And this action appears to be a lasting one. After restarting the Brave browser a couple of times, the WhatsApp Web app keeps being loaded without a problem.
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Hi everyone,
Thank you for taking the time to share all the relevant information! Please be advised that our team is aware of the issue and are currently investigating the matter.
We ask for your patience while they work to resolve the matter.
Thanks in advance!
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Anyone with whatsapp issues, please re-test in the latest 1.40.105. Does this build help?
Seems to work after turning shields off and then restarting Brave.
Does restarting Brave, then with shields up help?
Disabling Honey worked for me too! Thanks 
I am trying everything mentioned so far in this thread and nothing is working — it has been two weeks…
Same results (problem still happens).