What is nsd.exe?

The genuine nsd.exe file is a software component of IBM (Lotus) Notes by IBM.
The Notes System Debugger (NSD) is a troubleshooting tool in the IBM Lotus Notes/Domino enterprise e-mail and collaboration system where enterprise e-mail is maintained on a centralized server and accessed by client PC's and mobile devices. Uninstalling the Client side of Notes as a whole, (from version 8.0 forward), consists of deleting the folder created at installation by unzipping the Eclipse IDE (which is in Java) plus special plugins. Specifically uninstalling the NSD requires a network administrator. The NSD generates a logfile for analysis by support desk personnel. If it launches automatically it is a sign that the Notes/Domino environment is seriously compromised. It can also be run manually when troubleshooting, on a client or server. IBM is headquartered in Armonk, NY, USA, and was originally formed from several companies in 1911 by its founder, Thomas Watson, who took its current name from a Canadian subsidiary in 1924. It has continually shifted its focus away from manufacturing towards enterprise solutions and cloud computing.

NSD stands for Notes System Debugger

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the nsd.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Nsd.exe file information

Windows Task Manager with nsd
Nsd.exe process in Windows Task Manager

The process known as wnsd or IBM Lotus Notes/Domino belongs to software IBM wnsd or IBM Notes Diagnostics or ]project-open or IBM Lotus Notes/Domino by IBM (

Description: Nsd.exe is not essential for the Windows OS and causes relatively few problems. Nsd.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 5,159,936 bytes (25% of all occurrences), 3,411,968 bytes and 5 more variants. 
The program has no visible window. Nsd.exe is not a Windows system file. There is no description of the program. Nsd.exe is able to monitor applications and manipulate other programs. Therefore the technical security rating is 39% dangerous.

Uninstalling this variant: You can use the software publisher’s support [1][2], update the program or uninstall IBM Notes Browser Plug-in or ]project-open[ from your computer using the Control Panel applet Uninstall a Program.

Recommended: Identify nsd.exe related errors

If nsd.exe is located in a subfolder of C:\, the security rating is 40% dangerous. The file size is 3,399,680 bytes (20% of all occurrences), 5,157,888 bytes, 5,168,232 bytes, 5,164,136 bytes or 3,282,312 bytes. The program has no visible window. The nsd.exe file is not a Windows system file. The application has no file description. It is a Verisign signed file. Nsd.exe is digitally signed. Nsd.exe is able to monitor applications and manipulate other programs.

Important: Some malware camouflages itself as nsd.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the nsd.exe 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.


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Best practices for resolving nsd issues

A clean and tidy computer is the key requirement for avoiding problems with nsd. 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, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the nsd.exe 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. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

nsd.exe [all]