How do I create a Subject Alternative Name certificate?

How do I create a Subject Alternative Name certificate?

Creating a self-signed certificate with Subject Alternative Name

  1. Create a file with the name domain.cnf and add the following configuration as per your requirement:
  2. Download the Openssl utility.
  3. Create the certificate either on Microsoft Windows or on Linux:
  4. Create the .pfx file from cert and key file:
  5. Import the .

How do you generate CSR with Subject Alternative Name in OpenSSL?

How to create a certificate using OpenSSL with Subject Alternative Name field (SAN)

  1. Download OpenSSL.
  2. Become a self-signing Certifying Authority (CA)
  3. Create a configuration file for the certificate with Subject Alternative Name.
  4. Create a Certificate Signing Request (CSR)
  5. Sign the request.

How do you generate CSR with San names?

Create a CSR for a SAN certificate Open the command prompt as an administrator and change the directory to C:\OpenSSL-WinXX\bin. Generate the CSR and KEY file with this command. Enter the details to complete the CSR. Common Name must be the FQDN of the inSync master server.

What is certificate Subject Alternative Name?

The Subject Alternative Name field lets you specify additional host names (sites, IP addresses, common names, etc.) to be protected by a single SSL Certificate, such as a Multi-Domain (SAN) or Extend Validation Multi-Domain Certificate.

How do you change the Subject Alternative Name?

Subject Alternative Name (SAN) is an extension to X….Do the following:

  1. Open the hosts.
  2. Add the loop back addresses and the host names.
  3. Verify if the hosts were added, by pinging each host in the Command prompt.
  4. Create a copy of the pscpki.

How do subject alternative names work?

How do you add Subject Alternative Name in CSR IIS?

Create a Certificate Signing Request (CSR)

  1. Choose Proceed without enrollment policy and Click Next.
  2. Give a friendly name for the certificate and a description.
  3. Click on Subject tab and add all the hostnames under “Alternative Name“

What is Distinguished_name?

Distinguished name (DN) is a term that describes the identifying information in a certificate and is part of the certificate itself. A certificate contains DN information for both the owner or requestor of the certificate (called the Subject DN) and the CA that issues the certificate (called the Issuer DN).

What is a .CRT file?

A file with . crt extension is a security certificate file that is used by secure websites to establish secure connections from web server to a browser. Secure websites make it possible to secure data transfers, logins, payment card transactions, and provide protected browsing to the site.

Does OpenSSL generate CSR’s with subject alternative name extensions?

This post details how I’ve been using OpenSSL to generate CSR’s with Subject Alternative Name Extensions. You may have noticed that since Chrome 58, certificates that do not have Subject Alternative name extensions will show as invalid.

Why CSR extensions are not being transferred to the certificate?

This is an expected behaviour. As per official documentation from openssl Extensions in certificates are not transferred to certificate requests and vice versa. Due to this, the extensions which we added in our CSR were not transferred by default to the certificate. So these extensions must be added to the certificate explicitly.

Why is my CSR for San empty?

So our CSR contains all the IP Address and DNS value which we provided while generating the CSR for SAN. We get an empty output. The SAN Extensions are missing from our certificate. This is an expected behaviour.

How do I view the San extensions in the CSR?

You’ll notice that you’ll not be prompted for the SAN extensions but they’ll still be present in the CSR. You can view them by running: Now proceed as normal to have your certificate signed by a CA, import to your devices and hopefully not receive any more untrusted certificate errors.