What is dns.exe?

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 dns.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.

Click to Run a Free Scan for dns.exe related errors

Dns.exe file information

The process known as FTP Serv-U Daemon or Domain Name System (DNS) Server belongs to software Microsoft Windows Operating System or Serv-U by Microsoft ( or Cat Soft (

Description: The original dns.exe from Microsoft is an important part of Windows, but often causes problems. Dns.exe is located in the C:\Windows\System32 folder. Known file sizes on Windows 10/8/7/XP are 421,888 bytes (50% of all occurrences), 6,748 bytes, 450,048 bytes or 463,872 bytes. 
The program has no visible window. Dns.exe is a trustworthy file from Microsoft. The process uses ports to connect to or from a LAN or the Internet. Therefore the technical security rating is 25% dangerous; however you should also read the user reviews.

Recommended: Identify dns.exe related errors

Viruses with the same file name

Is dns.exe a virus? No, it is not. The true dns.exe file is a safe Microsoft Windows system process, called "FTP Serv-U Daemon". However, writers of malware programs, such as viruses, worms, and Trojans deliberately give their processes the same file name to escape detection. Viruses with the same file name are for example TrojanDownloader:Win32/Small (detected by Microsoft), and BKDR_SERVU.BH or Cryp_Xed-12 (detected by TrendMicro).
To ensure that no rogue dns.exe is running on your PC, click here to run a Free Malware Scan.

How to recognize suspicious variants?

Important: Some malware disguises itself as dns.exe, particularly when not located in the C:\Windows\System32 folder. Therefore, you should check the dns.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.


User Comments

Its the file that runs the MS DNS server afik
The dns.exe service is used by windows servers to service DNS (Domain Name System) requests from hosts on a network. DNS requests are used to translate a computer’s name (e.g. localhost) to the computer’s IP address (e.g. so that the computer can be communicated with over a network.
make dns server

Summary: Average user rating of dns.exe: based on 5 votes with 3 user comments. 3 users think dns.exe is essential for Windows or an installed application. One user thinks it's probably harmless. One user thinks dns.exe is dangerous and recommends removing it.

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Best practices for resolving dns issues

A clean and tidy computer is the key requirement for avoiding problems with dns. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic 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 resmon 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 DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the dns.exe process on your computer, the following programs have proven to be helpful: Security 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. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

dns.exe [all]