Link Search Menu Expand Document

RCL CertificateBot for Windows

RCL CertificateBot runs as a Windows Service in a Windows Server. The Windows Service will run every four (4) days to automatically renew and save SSL/TLS certificates from a user’s subscription in the RCL Portal.

Automatically Renew SSL/TLS Certificates

You can use RCL CertificateBot to automatically renew SSL/TLS certificates created in the RCL Portal using the the following creation options :

  • Azure DNS (including SAN) - Recommended
  • Azure Key Vault (including SAN)

‘Stand Alone’ certificates are not supported by RCL CertificateBot.

Install RCL CertificateBot

Download the Files

  • Download the Windows Service files from the GitHub Project page in the Releases section:

  • Download RCL CertificateBot Files

  • Select the zip file with bitness (win-x86, win-x64, win-arm) to match your Windows server bitness

  • Extract the zip file to a folder on your server after it is downloaded

Configure the Service

Register an AAD Application

An Azure Active Directory (AAD) application must be registered to obtain permission to access a user’s Azure resources (eg: DNS Zone).

Please refer to the following link to register an AAD application:

Set Access Control for the AAD application

Access control must be set for the AAD application to access resources in a user’s Azure subscription (eg: DNS Zone). Please refer to the following link to set access control :

Get the AAD Application Credentials

Please refer to the following link to get the AAD credentials to configure the service :

Add the Configuration variables

  • In the folder containing the files for the Windows Service that you extracted, find and open the appsettings.json file

  • Add the credentials for the AAD Application in the Auth section :

    • client_id
    • client_secret
    • tenantId
  • In the CertificateBot section, set a folder path to save the SSL/TLS certificates in the server. Create the folder in the server and set it with read/write permissions so that the certificates can be saved to it :

    • saveCertificatePath
  • The includeCertificates settings will allow for including specific certificates by its name (eg: [ “” ] or [“, *”] for SAN) as an array of strings in the renewal operation. Multiple certificates can be also be set (eg: [ “”, “”, “, *” ]). To include all certificates in the renewal operation, leave the settings as [ “all” ]

  • The serverIdentifier setting should be used to identify the server in which the service is being installed

  "Auth": {
    "client_id": "3434354ere455-6464-5456",
    "client_secret": "~irjhfyyr-6653gfghf",
    "tenantId": "47735-477635-46534"
  "CertificateBot": {
    "saveCertificatePath": "c:/ssl",
    "includeCertificates": ["all"],
    "serverIdentifier": "default",
    "bindings": []
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    "EventLog": {
      "LogLevel": {
        "Default": "Information",
        "Microsoft.Hosting.Lifetime": "Information"
  "RCLSDK": {
    "apiEndPoint": "",
    "armResource": "",
    "keyVaultResource": ""
  • Save the appsettings.json file when you are done.

Create the Windows Service

  • Open a Command Prompt in the Windows server as an Administrator

  • Run the command to install the Windows Service. Replace the < file-path > placeholder with the actual path where your windows service files were downloaded and extracted

sc.exe create CertificateBot binpath= <file-path>\RCL.CertificateBot.WindowsService.exe
  • After the service in installed, open Services in the Windows server and Start the service


  • You can set the Properties of the service to start automatically when the server starts


View the Event Logs

  • Open Event Viewer, under ‘Windows Logs > Application’, look for the ‘RCL.CertificateBot.WindowsService’ events


  • Ensure that there are no error events for the service. If there are error events, the service is misconfigured and will not function

  • Additional logs can be found at the location : < saveCertificatePath > / log.txt, where ‘saveCertificatePath’ is the path that you configured in ‘appsettings’ to save the SSL/TLS certificates

  • Each time a certificates is downloaded and saved in the server or a certificate is scheduled for renewal, a log will be written

Deleting the Windows Service

Run the command to delete the service

sc.exe delete CertificateBot  

Fixing Errors

If you encounter error events for the service in the Event Viewer, please stop the service and delete it completely. Ensure the ‘appsettings’ configuration is correct for the AAD Application and the certificate save path settings. Then, re-install and restart the service.

Installing Certificates in Web Servers

RCL CertificateBot will save renewed TLS/SSL certificate files to a folder in the server. You should then configure the web server to use these files to implement SSL/TLS in your website.

Please follow the links below to configure your web server: