What is mrxsmb20?
The genuine mrxsmb20.sys file is a software component of Microsoft Windows Operating System by Microsoft Corporation.
"Mrxsmb20.sys," Microsoft's "Longhorn SMB version 2.0 Redirector", is a Microsoft mini-redirector driver in "C:\Windows\System32\drivers". Together with the Redirected Drive Buffering Subsystem (RDBSS), it translates application requests for operations on files on remote computers into Server Message Block (SMB) protocol sessions and requests over TCP/IP. The Windows OS codenamed "Longhorn" launched in 2007, close to Vista. In Vista and Win7 it handled SMB 2.0 traffic, and in Win8/8.1/10 it handles SMB 3.0 as well..) A memory corruption bug in "mrxsmb20.sys" making it crash (BSOD) when connecting to a malicious SMB server was patched in early 2017.
mrxsmb20 stands for Longhorn Mini-Redirector For Server Message Block Protocol 2.0
Mrxsmb20.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the operating system, hardware etc.
The free file information forum can help you determine if mrxsmb20.sys is a Windows system file or if it belongs to an application that you can trust.
Run a free scan to check for mrxsmb20 drivers in need of updating
Mrxsmb20.sys file information
The process known as Longhorn SMB (version 2.0 Redirector) belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).
Description: The original mrxsmb20.sys is an important part of Windows and rarely causes problems. The file mrxsmb20.sys is located in the C:\Windows\System32\drivers folder.
Known file sizes on Windows 10/11/7 are 125,952 bytes (33% of all occurrences), 195,488 bytes or 57,856 bytes. 
The driver can be started or stopped from Services in the Control Panel or by other programs.
The mrxsmb20.sys file is a Windows system file. The program is not visible. The file is a trustworthy file from Microsoft.
mrxsmb20.sys appears to be a compressed file.
Therefore the technical security rating is 4% dangerous.
Uninstalling this variant:
If there are any problems with mrxsmb20.sys, you could also do the following:
Recommended: Identify mrxsmb20.sys related errors
Important: Some malware disguises itself as mrxsmb20.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the mrxsmb20.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.
Best practices for resolving mrxsmb20 issues
A clean and tidy computer is the key requirement for avoiding problems with mrxsmb20. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.
To get your computer running as fast as it did on day one, you can 8reset your PC. Your personal files will remain intact, but any programs you installed will need to be reinstalled.
To help you analyze the mrxsmb20.sys process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. A good Bantivirus software detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.
Other processes
spywareterminatorupdate.exe rdpvideominiport.sys gmx_mailcheck.dll mrxsmb20.sys ir_iexplorer2.dll mup.sys roccat_swarm_monitor.exe aida64.exe app_icon.exe pdfcreator_toolbar.dll dwservice.exe [all]
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