Determining which SMB protocol version your Windows 11 system uses can resolve persistent file sharing problems, NAS connectivity issues, and compatibility conflicts with older network devices. The Server Message Block protocol has evolved significantly since its inception, with SMB1 now considered a security liability while SMB2 and SMB3 offer improved performance and encryption. Microsoft has been phasing out SMB1 support across Windows versions, making version identification crucial for both security and functionality.

Why SMB Version Matters in Windows 11

SMB protocol differences aren't just technical details—they directly impact your daily computing experience. SMB1, first introduced in the 1980s, lacks modern security features and has known vulnerabilities that make it susceptible to attacks like WannaCry ransomware. Microsoft disabled SMB1 by default in Windows 11 22H2 and later versions, though it remains available as an optional feature for legacy compatibility.

SMB2, introduced with Windows Vista and Server 2008, brought significant performance improvements through reduced protocol overhead. SMB3, which debuted with Windows 8 and Server 2012, added encryption, improved failover capabilities, and better performance for virtualized environments. Knowing which version your system uses helps you balance security requirements with compatibility needs, especially when connecting to older NAS devices or network-attached storage systems.

Three Methods to Check SMB Version on Windows 11

PowerShell Method: The Most Comprehensive Approach

Open PowerShell as Administrator and run the command: Get-SmbConnection | Select-Object ServerName, ShareName, Dialect. This command displays all active SMB connections along with their protocol versions. The Dialect column shows numerical values: 2.0.2 represents SMB2, 2.1.0 indicates SMB2.1, 3.0 indicates SMB3, and 3.1.1 represents the latest SMB3.1.1 version.

For a broader view of what SMB versions your system supports, use: Get-SmbServerConfiguration | Select-Object EnableSMB1Protocol, EnableSMB2Protocol. This shows whether SMB1 and SMB2 protocols are enabled on your system. A TRUE value for EnableSMB1Protocol indicates SMB1 is active—a potential security concern that should be addressed unless absolutely necessary for legacy hardware.

Windows Features Method: Checking Installation Status

Navigate to Control Panel > Programs > Turn Windows features on or off. Scroll down to "SMB 1.0/CIFS File Sharing Support" and expand it. If any boxes are checked under this category, SMB1 is installed on your system. This method doesn't show whether SMB1 is actively being used, but it reveals whether the protocol components are present.

For SMB2 and SMB3, these are integral to modern Windows and cannot be disabled through this interface. Their presence is assumed in Windows 11 unless you're running an extremely customized or modified installation.

Registry Method: For Advanced Users

Open Registry Editor and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanServer\Parameters. Look for the SMB1 DWORD value. A value of 0 indicates SMB1 is disabled, while 1 means it's enabled. This method provides definitive confirmation but requires caution—incorrect registry modifications can cause system instability.

Interpreting Your SMB Version Results

When you see SMB3.1.1 in your PowerShell results, you're using the most current protocol version available in Windows 11. This version includes performance optimizations for high-latency networks and improved security through pre-authentication integrity. SMB3.0 connections are still secure and functional but lack some of the latest optimizations.

SMB2 connections should raise questions about why you're not using SMB3. This could indicate compatibility issues with the remote server or device, or configuration problems on either end of the connection. SMB1 connections represent a security vulnerability that should be eliminated unless you have specific legacy equipment that cannot be upgraded.

Practical Troubleshooting Scenarios

NAS Connectivity Problems

Many users discover SMB version issues when their Windows 11 computer cannot connect to a network-attached storage device. Older NAS units often default to SMB1 for compatibility, while Windows 11 increasingly restricts this protocol. If your NAS only supports SMB1, you have three options: enable SMB1 on Windows 11 (not recommended for security), upgrade your NAS firmware if SMB2/SMB3 support is available, or replace the NAS with a modern unit.

For NAS devices that support multiple SMB versions, check the device's administration interface to ensure it's configured to use SMB2 or SMB3. Some devices default to the highest common protocol version, while others need manual configuration.

File Sharing Between Windows Computers

When sharing files between Windows 11 computers, you should automatically negotiate SMB3 connections. If you're seeing SMB2 instead, check network profiles on both computers—the private network profile enables more features than public networks. Also verify that neither computer has SMB1 forcibly enabled through Group Policy or registry settings.

Performance Issues with Large Files

SMB3 includes features like SMB Direct (using RDMA) and SMB Multichannel that significantly improve performance with large files and high-bandwidth applications. If you're transferring large video files, database backups, or virtual machine images and experiencing slower-than-expected speeds, verify you're using SMB3.1.1 and that both client and server support these advanced features.

Security Implications of SMB Protocol Choices

Microsoft's security advisories consistently warn against using SMB1 in any environment. The protocol lacks encryption, uses weaker authentication methods, and has multiple documented vulnerabilities. While Windows 11 includes SMB1 as an optional feature for backward compatibility, enabling it should be a last resort for temporary connections to irreplaceable legacy equipment.

SMB2 and SMB3 include significant security improvements. SMB3 in particular adds end-to-end encryption, protecting data both in transit and from interception on the network. When checking your SMB version, prioritize connections using SMB3 with encryption enabled for sensitive data transfers.

Managing SMB Protocol Settings

Disabling SMB1 on Windows 11

If your system shows SMB1 as enabled, disable it immediately unless you have specific legacy requirements. Use PowerShell as Administrator and run: Disable-WindowsOptionalFeature -Online -FeatureName SMB1Protocol. This removes the SMB1 client and server components. Alternatively, use the Windows Features dialog mentioned earlier to uncheck SMB1 options.

After disabling SMB1, test connections to all your network resources. Document any devices that stop working—these will need upgrades, configuration changes, or replacement.

Forcing SMB3 Connections

While Windows 11 should automatically negotiate the highest available SMB version, you can configure minimum requirements. In PowerShell, use: Set-SmbClientConfiguration -RequireSecuritySignature $true -EnableSecuritySignature $true -RequireEncryption $true. This ensures your computer only establishes encrypted SMB3 connections, though it may break connections to devices that don't support these features.

Enterprise Considerations for SMB Management

In organizational environments, SMB protocol management extends beyond individual workstations. System administrators should use Group Policy to enforce SMB version requirements across their networks. The "Configure SMB v1 client driver" and "Configure SMB v1 server" policies allow centralized control over protocol availability.

Monitoring tools should track SMB version usage across the network. Unexpected SMB1 connections could indicate compromised systems, unauthorized devices, or configuration drift. Regular audits of SMB protocol usage help maintain security posture while identifying legacy equipment that needs upgrading.

Future Developments in SMB Protocol

Microsoft continues to enhance SMB capabilities with each Windows release. Recent improvements include better compression algorithms in SMB3.1.1 and performance optimizations for solid-state storage. As more organizations adopt always-on VPNs and hybrid work environments, SMB over QUIC provides reliable remote file access without traditional VPN requirements.

Windows 11's ongoing development suggests further SMB enhancements will focus on cloud integration, better performance over high-latency connections, and improved security through hardware-based encryption. Regular protocol checks ensure you benefit from these improvements as they become available.

Actionable Recommendations for Windows 11 Users

First, run the PowerShell command Get-SmbConnection to audit your current SMB connections. Document any SMB1 usage and develop a plan to eliminate it. For SMB2 connections, investigate why SMB3 isn't being used—upgrade or reconfigure the remote device if possible.

Second, verify SMB1 is disabled on your system unless you have documented, unavoidable legacy requirements. The security risks outweigh the convenience for most users.

Third, configure your preferred SMB settings for new connections. While Windows 11 defaults are generally sensible, power users might want to enforce encryption or specific protocol versions for their use cases.

Finally, establish a regular check-in schedule. Network environments change—new devices get added, old equipment gets replaced, and software updates alter compatibility. Quarterly SMB protocol audits help maintain optimal performance and security without unexpected connectivity disruptions.

Understanding your SMB protocol version isn't just technical trivia—it's fundamental to secure, reliable network file access in Windows 11. The tools Microsoft provides make version checking straightforward, while the implications of your findings guide meaningful improvements to both security and performance across your network environment.