How to Fix An Extended Error Has Occurred in Windows 11 & Windows 10

 set-smbclientconfiguration - requiresecuritysignature $false

Disabling SMB client security signatures, or setting 

RequireSecuritySignature to $false using Set-SmbClientConfiguration, means the client will not demand SMB signing for its outbound connections. 

Here's an explanation of what SMB signing is and the implications of disabling it:

go to power Shell command and past  press y enter button

set-smbclientconfiguration - requiresecuritysignature $false

What is SMB signing?

SMB signing adds a digital signature to every packet of data transmitted over an SMB connection. This signature is generated using a combination of the session key and a cipher suite and includes a hash of the entire message within the SMB header. 

Why is it used?

• Data Integrity: Verifies that data has not been tampered with during transmission.
• Authentication: Confirms the identity of both the sender and the receiver, preventing relay and spoofing attacks (also known as Man-in-the-Middle attacks). 

Impact of disabling SMB client signing

• Security Vulnerability: Disabling SMB client signing exposes the client to potential man-in-the-middle attacks where an attacker could intercept and modify SMB traffic without detection. This could lead to compromised sessions, unauthorized access to resources, or even remote code execution.
• Compatibility: Some older devices or third-party implementations may not support SMB signing. Disabling it on the client side might be necessary to establish communication with such devices.
• Performance Implications: SMB signing adds a computational overhead as each packet needs to be signed and verified. Disabling it might result in a slight performance improvement, but this comes at the cost of reduced security. 

Recommendations

• Microsoft recommends keeping SMB signing enabled for security reasons.
• If you encounter connectivity issues with third-party devices, investigate whether those devices can be configured to support SMB signing instead of disabling it on the client side.
• If disabling SMB client signing is absolutely necessary for compatibility, ensure that your network is otherwise secure and that the risk of man-in-the-middle attacks is minimized.
• Avoid using guest accounts with SMB shares, as this bypasses security mechanisms including SMB signing.