Generating a CSR on Zimbra

Generating a CSR on Zimbra

The Zimbra mail server provides two different methods for generating a Certificate Signing Request (CSR):

  • zimbra administration console (web interface)
  • zimbra certificate manager (command line interface).

CSR generation via Zimbra Administration Console

To enter the administration console for CSR generation, use the following URL pattern: https: //

In this link, is the current Zimbra server name or IP address; default port is 7071.

1) Put in the complete administrator address, such as and then enter the password.

ចុច ចូលគណនី:

៥) ចុចលើ កំណត់រចនាសម្ព័ន្ធ in the left list of the main menu.

3) In the next window, click on វិញ្ញាបនប័ត្រ and pick the option ដំឡើងវិញ្ញាបនប័ត្រ:

4) You will see the separate window where you need to choose the required mail server. Click បន្ទាប់ afterwards:

5) Pick the បង្កើត CSR option to start the generation process:

6) Fill in all necessary information:

  • Common Name is a fully qualified ឈ្មោះដែន name for which the SSL will be activated. For SSL Wildcard certificates, an asterisk should be placed in front of the domain name (e.g., *
  • Country Name is a two capital letter (អាយអេសអូ 3166-1 compliant) code of the country where the company or applicant is located (e.g., US).
  • State/Province is a state, county or region where the company or applicant is located (e.g., California).
  • City is a city or town, village where the company or applicant is located. (e.g., Los Angeles).
  • Organization name is the officially registered name of the organization that applies for a certificate. If you do not have any, put NA here.
  • Organizational Unit is the name of the department or division within your organization. If you do not have any, put NA here.

If you are going to activate a single domain SSL certificate, click on the យក button to delete the Subject Alternative Name. Once done, click បន្ទាប់ to proceed:

7) Download the CSR file, open it with any text editor, and copy the whole CSR code including the Begin Certificate និង End Certificate lines for further SSL certificate activation in the 1Byte account.

CSR generation via Zimbra Certificate Manager (command line interface)

A Zimbra package has the “zmcertmgr” tool to manage SSL certificates.

For versions 8.6 or lower, this tool must be run as root. Run this command in the terminal to get root privileges:

sudo ស៊ូ

Starting from version 8.7 this tool should be run as a zimbra user. Run these commands to switch from the default user to the zimbra user:

sudo ស៊ូ

su zimbra

Run the following command to generate a new CSR code for a single domain SSL certificate:

/opt/zimbra/bin/zmcertmgr createcsr comm -new -subject “/C=US/ST=CA/L=Los Angeles/O=1Byte/OU=NA/” -noDefaultSubjectAltName

  • Where C – Country
  • ST – State (region)
  • L – Locality (city, town, etc.)
  • O – Organization name
  • OU – Organization Unit
  • CN – Common Name (primary server hostname)

(All this information should be your own contact information)

To generate a CSR for a Wildcard certificate, put the server hostname in this format: *
If you would like to generate a CSR for multiple domain names, run this command:

/opt/zimbra/bin/zmcertmgr createcsr comm -new -subject “/C=US/ST=CA/L=Los Angeles/O=1Byte/OU=NA/” -subjectAltNames “,”

Where CN – primary server hostname and subjectAltNames “,” – additional hostnames separated by a comma.

Once the CSR file is generated, open it with this command:

cat /opt/zimbra/ssl/zimbra/commercial/commercial.csr

The CSR code should look like:

Copy the full output including the header —–BEGIN CERTIFICATE REQUEST—– and footer —–END CERTIFICATE REQUEST—– for further SSL activation in the 1Byte account.

ចំណាំ: The corresponding private key will be saved in this file /opt/zimbra/ssl/zimbra/commercial/commercial.key

It will be required for SSL certificate ការដំឡើង on this or other server.