Why is my network messed up after update to windows 11 24H2

I have tried all of the above suggestions and none worked. I have stumbled upon a sort of work around. I have a USB attached to my router and could see just fine under 23H2, updated to 24H2 and the USB is no longer findable. I reinstalled 23H2 and USB was visible. Her is my work around. Under 23H2 I went into File Explorer and pinned my readyshare\USB to Quick Access. After installing 24H2 I noticed that the USB was still pinned to Quick Access and I could open it and read and write to it. I can not see the readyshare\USB on the network nor can I find any information about its, but it works. Maybe those of you with more knowledge of Windows 11 can use this information to determine how to map to the network USB.

I followed everyone's suggestions to allow the "everyone" account to access the shares, but nothing works. I have just re-installed version 14H2 and noticed one thing: they removed SMB2 and SMB3 support and left only SMB1 (the one they recommend we not use). I surrendered for a while and used login PIN numbers on all the computers. All works, but it is a hassle I don;t need. I also created shares on TrueNas and Openmediavault, which work flawlessly. I am using Kubuntu right now to see if I can migrate all the shares to something easier to configure. Apparently, Kubuntu is working perfectly. It recognizes my wireless NIC, my printers and even my Brother scanner. It is passworded by default, which may be the reason for the flawless connection. The good thing is that I can bypass the password at login if configured at set up. BTW, I also miss the Home Group. MS will need to simplify the process if they want clients to adopt 24H2 more quickly.

Samba drives are gone, no longer able to connect back. Forget enabling insecure sign-in, or changes of protocol (1, 2, 3), or whatever been suggested in this or parallel threads. It's just broke.

The whole network connection is unstable, snapping at random times for a minute or so - mildly noticeable when browsing, but enough to terminate SSH link with a server. Remote work has never been so enjoyable.

It's been long months since first reports about connectivity issues in 24H2 appeared on this forum. Microsoft not only did little to fix the issues, it does not even trouble itself to mention them [https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-24h2]. Wow! Congratulations for complacency. Head in the sand. Instead it lets its users wander through endless fora where one encounters multiple hacks that supposedly work, but in fact more than often just make the OS more vulnerable, or break something else entirely. Experimenting like that before figuring out what is the actual cure, if any, one can easily cripple the entire system. But maybe that's intentional, huh?

It takes a bit of digging to get to the technical page [https://learn.microsoft.com/en-us/windows/whats-new/whats-new-windows-11-version-24h2] where changes in the SMB support are mentioned. But the issue is probably elsewhere, as the error suggest the requested site could not be found, not that there's protocol problem.

I had the same problem when 24H2 was installed on one of my computers. I installed it on two computers. Computer number 1 shares the files. Computer number 1 can access computer number 2 shared files (although that isn't the directly we are trying to share). Computer number 2 cannot access shared files. Norton also decided that computer 2 was a malicious attack and blocked it. Computer number 2 went back to the prior version and can see shared files and is no longer considered to be a malicious attack by Norton. Both computers only have 2 logins. My windows login and my husband's windows login. I have logged into both computers with my password to link up the computers (this used to work). Neither files have a guest login enabled. I tried all of the listed steps on this thread but nothing worked except for removing the updated version of windows.

On another note computer number 3 on the network which is still using Windows 10 could always see the shared files and was not interrupted with the update on computer 1.

The change in how Norton viewed the connection isn't something that was mentioned and seems odd it went away removing the update. What in the update would tell another windows computer that it is malicious.

Also, even after I temporarily disabled the block on computer 1 in Norton, Norton still blocked the access (listed on the block list and gave me an alert). I added computer 2 to the exclusion list and it still blocked it as well.

Just saying... I miss the days of the Home Group.

Thanks mate but I've tried all them and still no result, windows is so frustrating at times, they change things I like and keep stuff I don't. All I want to do (as I suspect most people) is to surf the net and do a bit of shopping, listen to some music and send/receive emails.

However I have found a work around, via add a new network location it will do until I find a better solution.