OpenSSL - Installation under Windows

In some situations, it can be useful to generate a CSR using OpenSSL. This manual describes the installation of OpenSSL under Windows.

  1. Download the OpenSSL for Windows installation package.
  2. Double-click the installation file.
  3. If the following error message appears, you should install Microsoft Visual C++ 2008 Redistributables. The installation file can be downloaded here
  4. Double-click the installation file and click on Next Open SSL - Installatie onder Windows
  5. Click on I accept the agreement, followed by NextOpen SSL - Installatie onder Windows
  6. Leave the default installation path (C:\OpenSSL-Win32) and click on NextOpen SSL - Installatie onder Windows
  7. Leave the default Startmenu folder(OpenSSL) and click on NextOpen SSL - Installatie onder Windows
  8. Leave the The Windows system directory and click on NextOpen SSL - Installatie onder Windows
  9. Click on InstallOpen SSL - Installatie onder Windows
  10. Click on Finish once the installation has been completed.

OpenSSL for Windows has now been installed and can be found as OpenSSL.exe in C:\OpenSSL-Win32\bin\. Always open the program as Administrator.
Note: The following error message might appear when running OpenSSL:

WARNING: can't open config file: /usr/local/ssl/openssl.cnf

This can be solved as following:

  1. Close OpenSSL.
  2. Open a Command Prompt (CMD) as Administrator
  3. Run the following command: SET OPENSSL_CONF=C:\OpenSSL-Win32\bin\openssl.cfg
  4. Reboot the computer.


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