What is Stunnel.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 Stunnel.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 Stunnel.exe related errors

Stunnel.exe file information

Windows Task Manager with Stunnel
Stunnel.exe process in Windows Task Manager

The process known as stunnel or Plesk 8.3 for Microsoft Windows belongs to software stunnel by SWsoft (

Description: Stunnel.exe is not essential for Windows and will often cause problems. The Stunnel.exe file is located in a subfolder of "C:\Program Files". Known file sizes on Windows 10/8/7/XP are 91,648 bytes (25% of all occurrences), 90,112 bytes and 7 more variants. 
The file is not a Windows core file. There is no file information. The software uses ports to connect to or from a LAN or the Internet. The program is not visible. Therefore the technical security rating is 55% dangerous, however you should also read the user reviews.

Uninstalling this variant: You might want to safely remove the program using the uninstall program of stunnel or Camelsystem Powerpost SSL (Control Panel ⇒ Uninstall a Program).

Recommended: Identify Stunnel.exe related errors

Important: Some malware camouflages itself as Stunnel.exe. Therefore, you should check the Stunnel.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

I have had nothing but possitive experiences with stunnel.exe. It has been integrated into several applicatons I wrote in order to add email functionality.
  TobY Sentinel  

Summary: Average user rating of Stunnel.exe: based on 1 vote with 1 user comment. One user thinks it's neither essential nor dangerous.

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Best practices for resolving Stunnel issues

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

Stunnel.exe [all]