MacOS Sequioa Safari issues

Same thing here. Apple support keeps passing me off to other people and everyone acts like this is a big surprise and I'm the only one...total nonsense. Hours have been wasted on this issue. They need to fix Sequoia 15.

For me, it mostly works, but when accessing web site with Digest authentication, it results in "400 Bad Request". It appears that Authorization header of such requests has a list of fields repeated multiple times, which is clearly a bug. Sometimes it creates a long line with fields repeated over and over. Some web-servers are not happy with that (nginx, for example). Before Sequoia upgrade, everything worked fine.

Building on the previous posting 👍

There are 3 Categories of Third Party Software / Services that are baffling to me.

Why some users insist on installing and using the below software. 

In no special orders 

Commercial VPNs 

They may not be what one believes they are doing for the computer and what they actually are doing behind the scenes 

https://gist.github.com/joepie91/5a9909939e6ce7d09e29

Third Party Security Software 

There are no known Windows-like Viruses in the wild that self replicate and affect macOS, because of the underling UNIX  Foundation and Permission Limitation. 

The Operating System resides in a Sealed and Read Only Volume that cannot be opened by the User nor by Third Party Applications.

The Only thing this Antivirus software is protecting is the Bank Account of the Developers and for zero return to the User aside from the problems this software creates.

Security. Built right in

Mac app security enhancements

The Built in Security  is all that is required to protect the computer.

Protecting against malware in macOS

Third Party Disk Cleaners / Optimizer 

Any Third Party Applications that will interfere with the normal operation of the OS,  is an invitation for disaster. 

Certain Applications maybe available on the Apple Apps Store - this only means the Developer is prepared to pay Apple a percentage on each sale. 

What the Application may do to the computer is up to the User to check this out before purchase

To put the Third Party Disk Cleaner / Optimizer in context and the damages it may have or has already done.

This type applications can or will Muck Up your User Account ( Home Folder ) of this machine.

It does not touch the Operating System itself unless you consider your User Account ( Home Folder ) as part of the Operating System

In which case, the Operating System is hosed

akire308 wrote:

Thanks for the explanation but I did not install any of the 3rd party softwares.

Also, I never experience any issues when I updated OS 16 & 17. Only happens after sequioia

iOS is for iPhones and iPads and iWatches

Download the Application Etrecheck  ( External Link ) directly from the Developer.

The Application is Not a " Silver Bullet "  and is  only a tool to examine the Hardware / Software used on this computer 

This is a Diagnostic Tool that makes no changes to the computer Hardware / Software used on this computer 

The application is free or paid from added features. 

The Report will Not Reveal Any Personal Information. 

Post back the Full Report - copy and paste - >>>> using the Additional Text Icon ( 3rd Icon to last ) <<<<

The most likely cause is interference from 3rd party software, most likely some "security" app.

Error 400 issue is not yet solved with 15.0.1...

:-(

I also had the same issue of Safari not able to access the web after installing Sequoia. I disabled Hush - a cookie blocker - in Safari Settings and Safari worked perfectly again.

For what it's worth, after the Sequoia update, Safari failed to load web sites for me. I tried the obvious without success (reboots, clear cache, etc.). Brave and Chrome had no problems with the same sites. What solved it for me was turning my Wireguard VPN client on and then off (it was off prior to the upgrade). For some reason, that toggle cleared the issue and Safari loads correctly.

Same problem here. Mac mini 2018 (Intel i7, 64GB RAM, 2TB SSD) went from most recent Sonoma to most recent Sequoia. No problems with Sonoma; problems started immediately on using Safari with Sequoia..

Saw some posts/recommendations.

REC#1. Turn off MacOS's built-in optional firewall in the Settings menu. Did that and it worked immediately but after a shut-down and re-start, the problem reappeared with Safari (even with the Firewall off).

REC#2. Remove 3rd-party software/extension from Safari. Did that (had Adguard for Safari installed) and the problem disappeared. Will continue to run with no firewall and no 3P extensions for a short bit to see if problem reappears.

Do you have any VPN or firewall apps installed prior to upgrading? It might be causing the problem. This was true for me and I had to uninstall NordVPN and Lulu firewall, and then reinstall them. Safari now works as expected. Here’s the details of the fix.

You can inspect the request headers in Safari's network tab. I have the same issue, and I can see the Authorization header value is duplicated, making the request fail. The only way to solve it is to restart Safari. I hope Apple fixes it soon