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An SSL Certificate cannot be issued: Could not issue a Let's Encrypt SSL/TLS certificate for example.com

Rangel Sardinha
Updated
Plesk for Windows kb: technical ext: sslit

Applicable to:

  • Plesk for Windows

Symptoms

1. Attempting to issue an SSL Certificate via Domains > example.com > SSL/TLS Certificates > install Let's Encrypt Certificate results in the following error:

PLESK_ERROR: Could not issue an SSL/TLS certificate for example.com
Details
Could not issue a Let's Encrypt SSL/TLS certificate for example.com.

2. The following errors can be found in %plesk_dir%admin\logs\php_error.log:

CONFIG_TEXT: [2025-04-24 14:41:42] 11668:680a07530e8bc DEBUG [extension/letsencrypt] pm_Exception: Unable to execute command extension: proc_open(): Command conversion failed
file: C:\Program Files (x86)\Plesk\admin\plib\pm\ApiCli.php
line: 269 code: 
0 trace: 
#0 C:\Program Files (x86)\Plesk\admin\plib\pm\ApiCli.php(60): pm_ApiCli::execSimple(string 'extension', string '"C:\Program Files (x86)\Plesk\bin\extension.exe"  --call sslit --common-challenge-dir -info -format ...', integer '1', array, string '')
#1 C:\Program Files (x86)\Plesk\admin\plib\modules\letsencrypt\library\PleskCli\PleskCliService.php(23): pm_ApiCli::call(string 'extension', array, integer '1')
#2 C:\Program Files (x86)\Plesk\admin\plib\modules\letsencrypt\library\Environment\CommonChallengeDir.php(73): PleskExt\Letsencrypt\PleskCli\PleskCliService->call(string 'extension', array)

3. The folder C:\Windows\System32 is missing from the Path System environment variable.

Cause

The C:\Program Files (x86)\Plesk\admin\plib\pm\ApiCli.php utility cannot open a process since Path System Environment Variable is missing C:\Windows\System32, which results in failure to issue an SSL Certificate.

Resolution

To add the System Environment Variable, do the following:

  1. Press Win + R, type sysdm.cpl, and press Enter.
  2. Go to the Advanced tab.
  3. Click Environment Variables.
  4. Under System variables, find and select Path, then click Edit.
  5. Click New and add: C:\Windows\System32
  6. Reboot the server to apply the changes.
PPS-17700 - for more details. Note, if you see more cases like this - this is not Plesk bug. Plesk never removes system env. variables.
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Comments

2 comments
Date Votes
  • Avatar
    victor imo

    i bought the Positivewildcard SSL from you through plesk, but i cant find it again after i uninstalled it and try to reissue it because the ssl didnt reflect on my subdomain, that what my issue is about, maybe you can start by providing the .pem file if i can upload it and it works?

    0
  • Avatar
    Rangel Sardinha

    Hello Victor, please open a ticket with customer service to check it for you. 

    0

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