Knowledgebase: CSR Generation
Zimbra CSR Creation & SSL Installation Instructions

Create CSR on Zimbra and SSL Installation

Zimbra CSR Creation

  1. Log in as root.
  2. Adjust the following command to match your information: /opt/zimbra/bin/zmcertmgr createcsr comm -new "/C=US/ST=NJ/L=Clifton/O=Company Inc/OU=Department/" Where:
  3. C = 2-digit country code
    ST = State/Province
    L = City
    O = Organization Name
    OU = Department (e.g., IT Department)
    CN = Common Name (, *
    If you want to include more than one name in the CSR, you can add -subjectAltNames to the end of the command. Example:


  4. Running this command will output the CSR to the following location: /opt/zimbra/ssl/zimbra/comodo/comodo.csr
  5. You will use the CSR to place the order for the certificate (select “Other” as the server software when placing your order).
  6. Zimbra SSL Installation

    1. Once you receive the .zip containing the certificate files, extract the “certs” folder somewhere on your server. We will be combining some the files you received in to a PEM format. To create the pem file, you can reference our PEM instructions or follow the next steps of these instructions.
    2. Take your server certificate (your_domain_name.crt) and copy it to a file called comodo.crt in the following directory: /opt/zimbra/ssl/zimbra/comodo/
    3. With a text editor (such as wordpad or notepad), copy and paste the entire body of each of the following certificates into one text file in the following order:
      1. The First Intermediate Certificate - COMODORSACA.crt
      2. he Second Intermediate Certificate(if a 2nd intermediate cert is supplied) – COMODORSADomainValidation.crt
      3. The Root Certificate - AddTrustExternalCAROOT.crt

    Make sure to include the beginning and end tags on each certificate. The result should look like this:

    (Your First Intermediate certificate: ComodoRSAAddTrustCA.crt)
    -----END CERTIFICATE-----
    (Your Second Intermediate certificate (if applicable): ComodoRSADomainValidation.crt)
    -----END CERTIFICATE-----
    (Your Root certificate: AddTrustExternalCAROOT.crt)
    -----END CERTIFICATE-----

  7. Save the combined file as comodorsaaddtrustca.crt in the following directory: /opt/zimbra/ssl/zimbra/comodo/
  8. Run the following command to validate the certificate chain: /opt/zimbra/openssl/bin/openssl verify -CAfile comodorsaca.crt comodorsadomainvalidation.crt
  9. Once the certificate chain is validated, you can run the following command to enable the new certificate for use: /opt/zimbra/bin/zmcertmgr deploycrt comm comodorsadomainvalidation.crt comodorsaca.crt

The SSL certificate should now be active.

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