Fix and Prevent: Multiple Connections to Server's Shared Resource (SMB Shares) on Windows Computers

Introduction

When two Windows computers are connected to a network via a Microsoft Account, users might encounter an error message: "The remote computer is not accessible. You might not have permission to use this network." This error occurs when the SMB (Server Message Block) protocol prevents multiple connections to a shared resource.

Understanding the Issue

SMB is a network protocol used for sharing files, printers, and other resources between computers. By default, SMB imposes a limit on the number of connections that can be established to a shared resource. This limit is set to prevent potential security vulnerabilities and improve overall system performance.

Checking the SMB Signing Settings

One possible reason for the "not accessible" error is the SMB signing settings. Ensuring that SMB signing is enabled on both computers can help resolve the issue:

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters] "Security Signature Level"="0"

To enable SMB signing: Regedit.exe

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters] "Security Signature Level"="1"

Configuring the Group Policy

Another solution is to configure the Group Policy settings for SMB. This can be done by following these steps:

1. Press Win + R and type "gpedit.msc" to open the Local Group Policy Editor.
2. Navigate to "Computer Configuration > Administrative Templates > Network > Lanman Server > Client".
3. Double-click on "Limit number of connections to a shared resource at once".
4. Set the policy to "Disabled" and click "OK".

Disabling NetBIOS over TCP/IP

Disabling NetBIOS over TCP/IP can also help resolve the issue. To do this:

[HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NetBT\Parameters] "EnableNetBIOSOverIP"="0"

Updating Network Adapter Drivers

Outdated network adapter drivers can cause compatibility issues with SMB. Updating the drivers can help resolve the error:

Right-click on the network adapter and select "Update driver".

References

• Microsoft Registry Editor
• Group Policy Editor
• Configure SMB signing on a server or a client in Windows 10, version 1607 or later