What is cygrunsrv.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 cygrunsrv.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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Cygrunsrv.exe file information

Windows Task Manager with cygrunsrv
Cygrunsrv.exe process in Windows Task Manager

The process known as AdeonaClientService belongs to software OpenSSH for Windows or copSSH or CYGWIN sshd by unknown.

Description: Cygrunsrv.exe is not essential for the Windows OS and causes relatively few problems. Cygrunsrv.exe is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 68,096 bytes (34% of all occurrences), 36,864 bytes and 5 more variants. 
There is no information about the author of the file. The program is not visible. It is not a Windows core file. Therefore the technical security rating is 56% dangerous, however you should also read the user reviews.

Uninstalling this variant: If you are having problems with cygrunsrv.exe, you can also visit the support page, check the vendor’s website for a newer version or uninstall the software OpenSSH for Windows or copSSH using the Uninstall a Program function of Windows Control Panel (Windows: Start, Settings, Control Panel, Uninstall a Program).

Recommended: Identify cygrunsrv.exe related errors

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

Used by cygwin service. Adds 'Linux/Unix' on Windows.
    (further information)
It's the Cygwin thing that allows Cygwin services to run like Windows ones.
  Malcolm   (further information)
cygwin SSH Daemon. Not dangerous, creates a ssh server in windows computer which emulates *nix behaviour.
Teil von um scripte als service zu starten.
  Per   (further information)
Dieser Service wird von Cygwin gebraucht um andere Cygwin programme als service zu starten
  roughL   (further information)
Program to run Cygwin services under Windows
  Anonymous   (further information)
Used for porting Linux programs to Windows. One example of an acceptable & necessary use is Clamwin Antivirus. Of course, like any tool, it can be used for good or evil.
  Glenn Black  

Rating chart

Summary: Average user rating of cygrunsrv.exe: based on 11 votes with 9 user comments. 5 users think cygrunsrv.exe is essential for Windows or an installed application. 3 users think it's probably harmless. 3 users think it's neither essential nor dangerous.

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Best practices for resolving cygrunsrv issues

A clean and tidy computer is the key requirement for avoiding problems with cygrunsrv. 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 cygrunsrv.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

cygrunsrv.exe [all]