Asked by: Diallo Unterbusch
technology and computing web hosting

How many names can a San certificate have?

Last Updated: 28th March, 2020

SAN restrictions
This means SAN certificates generally support only a specific list of names. It's also common to encounter a limit on the number of names per certificate, usually up to 100.

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Likewise, people ask, how do I create a SSL certificate with multiple common names?

Multiple Names on One Certificate

  1. Generate the Certificate Request File. For a generic SSL certificate request (CSR), openssl doesn't require much fiddling.
  2. Self-sign and create the certificate:
  3. Package the key and cert in a PKCS12 file:
  4. Import the certificate.
  5. Configure SSL Settings.

One may also ask, can I add subject alternative name to existing certificate? Subject Alternative Name (SAN) is an extension to X. 509 that lets you specify additional host names (values) to be protected by a single SSL certificate using a subjectAltName field. At the server-level, you can create multiple virtual hosts and add these hosts to the subjectAltName field of the certificate.

Also asked, what is San name in certificate?

A Subject Alternate Name (or SAN) certificate is a digital security certificate which allows multiple hostnames to be protected by a single certificate. A SAN certificate may also be called a Unified Communication Certificate (or UCC), a multi-domain certificate, or an Exchange certificate.

What is a multi domain San certificate?

Multi-Domain (SAN) SSL Certificates. A Multi-Domain SSL certificate, also known as a UCC, Unified Communications certificate, or SAN certificate, is a type of certificate that uses Subject Alternative Names (SANs) to secure multiple host names.

Related Question Answers

Reynalda Buchpfennig


What is Cn and san?

SAN stands for “Subject Alternative Names” and this helps you to have a single certificate for multiple CN (Common Name). You might be thinking this is wildcard SSL but let me tell you – it's slightly different. In SAN certificate, you can have multiple complete CN.

Dorka Diesing


What is Net :: Err_cert_common_name_invalid?

Error: "Subject Alternative Name Missing" or NET::ERR_CERT_COMMON_NAME_INVALID or "Your connection is not private" If the certificate doesn't have the correct subjectAlternativeName extension, users get a NET::ERR_CERT_COMMON_NAME_INVALID error letting them know that the connection isn't private.

Ibai Sechtling


What is OpenSSL CNF?

DESCRIPTION. The OpenSSL CONF library can be used to read configuration files. It is used for the OpenSSL master configuration file openssl. cnf and in a few other places like SPKAC files and certificate extension files for the x509 utility. OpenSSL applications can also use the CONF library for their own purposes.

Rachyd Perfold


What is SSL connection?

Secure Sockets Layer (SSL) is a standard security technology for establishing an encrypted link between a server and a client—typically a web server (website) and a browser, or a mail server and a mail client (e.g., Outlook).

Thurman Seitter


What is DNS name in certificate?

509 that allows various values to be associated with a security certificate using a subjectAltName field. DNS names: this is usually also provided as the Common Name RDN within the Subject field of the main certificate. Directory names: alternative Distinguished Names to that given in the Subject.

Teofila Hafermann


What is the use of SSL certificate?

What is an SSL certificate and what is it used for? SSL certificates are used to create an encrypted channel between the client and the server. Transmission of such data as credit card details, account login information, any other sensitive information has to be encrypted to prevent eavesdropping.

Illa Adonts


What is Wildcard SSL?

A wildcard certificate is a digital certificate that is applied to a domain and all its subdomains. Wildcard notation consists of an asterisk and a period before the domain name. Secure Sockets Layer (SSL) certificates often use wildcards to extend SSL encryption to subdomains.

Sinuhe Burnett


What is SANs in SSL certificate?

SANs are additional domain names added to an SSL certificate. SANs are the ideal solution to secure Microsoft Exchange and Office Communications Servers with Unified Communications Certificate (UCC), also known as a SAN cert.

Slimane Gronenwald


What is a valid certificate name?

The Common Name (AKA CN) represents the server name protected by the SSL certificate. The certificate is valid only if the request hostname matches the certificate common name. Most web browsers display a warning message when connecting to an address that does not match the common name in the certificate.

Cyndi Kurekova


What is common name in CSR?

Common name is a FQDN (Fully Qualified Domain Name). It can be either a domain name or subdomain name of a root domain ( Common name is what “ties” your SSL certificate and your domain name.

Kamilla Eceiza


What is common name in SSL certificate?

SSL Certificates
The Common Name (CN), also known as the Fully Qualified Domain Name (FQDN), is the characteristic value within a Distinguished Name. Typically, it is composed of Host Domain Name and looks like, "" or "".

Hristov Olnhoff


Is San a name?

as a girls' name has its roots in English and Hebrew, and the name San means "the sandpiper bird; lily, rose". San is a version of Sanny (English): a pretty-sounding name. San is also a variant of Susan (Hebrew): nickname of Susanna and Susannah.

Abdelkadir Deltell


What is the subject name of a certificate?

The subject of the certificate is the entity its public key is associated with (i.e. the "owner" of the certificate). The subject field identifies the entity associated with the public key stored in the subject public key field. The subject name MAY be carried in the subject field and/or the subjectAltName extension.

Gracinda Ridao


How does SNI work?

SNI stands for Server Name Indication and is an extension of the TLS protocol. It indicates which hostname is being contacted by the browser at the beginning of the handshake process. This technology allows a server to connect multiple SSL Certificates to one IP address and gate.

Sigfredo Kollen


What is a CSR file?

A CSR or Certificate Signing request is a block of encoded text that is given to a Certificate Authority when applying for an SSL Certificate. It also contains the public key that will be included in the certificate. A private key is usually created at the same time that you create the CSR, making a key pair.

Nezar Buron


What is San certificate and wildcard certificate?

Wildcard: a wildcard certificate allows for unlimited subdomains to be protected with a single certificate. The wildcard refers to the fact that the cert is provisioned for *. SAN: a SAN cert allows for multiple domain names to be protected with a single certificate.

Yones Ederra


What is SAN support?

The Subject Alternative Name (SAN) is an extension to the X. 509 specification that allows users to specify additional host names for a single SSL certificate. The use of the SAN extension is standard practice for SSL certificates, and it's on its way to replacing the use of the common name.

Jayro Eglevsky


Can you add a SAN to an existing certificate?

You cannot alter an existing certificate in any way. That will be missing the point of adding a cryptographically signing the certificate. If you want to add SAN, most CAs allow you to reissue a certificate with new details, though this will usually revoke your old certificate.

Ynocencia Muguiro


How do I change my SSL certificate to San?

How to add SAN(s) to an existing SSL certificate
  1. Certificates that offer SAN support are convenient for users that plan to secure multiple domains.
  2. Generate a new CSR/private key pair.
  3. Anytime a SAN is added to an existing cert, a new CSR is required.
  4. Access the supplier user portal:
  5. - Click Reissue Certificate which will take you to the section displayed below.