Windows 11 update 24H2 changes network access

My situation is almost identical.
I have one computer running 23H2 (our home Office computer). It serves as our file share server. Our second computer ("Kitchen") was running Windows 10 and was able to see the shared directories and files just fine. I bought a replacement Dell Inspiron because Windows 10 has passed end-of-life. The new Kitchen computer has Windows 11 24H2. It cannot see the shared files. The Network view in File Explorer sees \Office, but cannot open it or see the shared directories at all. I can ping \Office by IPv4 address, so I know the network path is working. I have tried all the published remedies I can find on Microsoft Answers and other sources: set computer name and workgroup; set network type to Private; Network discovery ON; sharing ON; password protection OFF; SMB on and starts automatically; file sharing computer always on; full access for Everyone on shared folders (and their parent folders, etc.); add the LanmanWorkstation key in regedit (which had no effect, so I took it back out); converted my Microsoft admin account to local; checked the NTFS permissions; turned off the firewall (no effect, so turned it back on); used the 'net share' command on the Office computer to verify that the folders are being shared; (re-)activated TCP/IP-NetBIOS on and starts automatically. So far no luck.

Has Microsoft provided any kind of workaround? Or better yet, a real fix?
I checked for Windows updates today. Nothing so far.

FOUND THE ANSWER!!! (at least for Win11 Home 24H2) File sharing is now working!!

The Microsoft tech discussion is here: https://techcommunity.microsoft.com/t5/storage-at-microsoft/smb-signing-required-by-default-in-windows-insider/bc-p/4285348#M1851

Need to turn off RequireSecuritySignature in the 24H2 client.

To see the current SMB signing settings, run the following PowerShell commands:

Get-SmbServerConfiguration | FL requiresecuritysignature

Get-SmbClientConfiguration | FL requiresecuritysignature

To disable the SMB signing requirement in client (outbound to other devices) connections, run the following PowerShell command as an elevated administrator:

Set-SmbClientConfiguration -RequireSecuritySignature $false

To disable the SMB signing requirement in server (inbound to your Windows 11 Canary Insider Enterprise, Pro, or Education edition device), run the following PowerShell command as an elevated administrator:

Set-SmbServerConfiguration -RequireSecuritySignature $false

To access PowerShell as Admin, Press Win + R keys together to open Run.

Type PowerShell in Run and press Ctrl + Shift + Enter keys together to open the PowerShell prompt with administrative privileges.

FOUND THE ANSWER!!! (at least for Win11 Home 24H2) File sharing is now working!!

To disable the SMB signing requirement in server (inbound to your Windows 11 Canary Insider Enterprise, Pro, or Education edition device), run the following PowerShell command as an elevated administrator:

Set-SmbServerConfiguration -RequireSecuritySignature $false

 

To access PowerShell as Admin, Press Win + R keys together to open Run.

Type PowerShell in Run and press Ctrl + Shift + Enter keys together to open the PowerShell prompt with administrative privileges.

THANK YOU!

File sharing is NOW working! I tried EVERYTHING else and yours fixed this nonsense!

MS needs to STOP screwing up stuff that was already working!

Updated today, I have a few shares that allow guest access, so that wasn't working, I had to enable guest access on Windows which seems is now disabled:

Set-SmbClientConfiguration -EnableInsecureGuestLogons $true

After that those shares started to work again.

Thank you MS.

Wish it had worked for me. Didn't though.