SMB 2.0 MiniRedirector (mrxsmb20) Service Defaults in Windows 8

Implements the SMB 2.0 protocol, which provides connectivity to network resources on Windows Vista and later servers.

Default Settings

Startup type: Manual
Display name:SMB 2.0 MiniRedirector
Service name:mrxsmb20
Service type:filesys
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\mrxsmb20

Default Behavior

The SMB 2.0 MiniRedirector service is a file system driver. In Windows 8 it will not be started until the user starts it. If SMB 2.0 MiniRedirector fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the mrxsmb20 service hasn't been started.


SMB 2.0 MiniRedirector can't start, if the SMB MiniRedirector Wrapper and Engine service is disabled or not available.

All the services listed below will not start if SMB 2.0 MiniRedirector is disabled:

Restore Default Startup Configuration of SMB 2.0 MiniRedirector

Before you begin doing this, make sure that all the services on which SMB 2.0 MiniRedirector depends are configured by default and function properly. See the list of dependencies above.

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config mrxsmb20 start= demand

3. Close the command window and restart the computer.

The mrxsmb20 service is using the mrxsmb20.sys file that is located in the C:\Windows\system32\DRIVERS directory. If the file is removed or corrupted, read this article to restore its original version from Windows 8 installation media.