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You can technically have as many certificates as you want? it's just a question of why you want to so many, and what you hope to accomplish. Next, you'll need to have any new SSL certificates validated by your chosen certificate authority (CA).

Add SANs to your multi-domain certificate Step 1: Generate CSR. ... Step 2: Sign in to your account. ... Step 3: Fill out the reissue form. ... Step 4: Complete domain control validation (DCV) ... Step 5: DigiCert reissues the multi-domain SSL/TLS certificate. ... Step 6: your reissued SSL/TLS certificate.

With a Multi Domain Certificate it's possible to secure multiple domain names and subdomains in one certificate. This type of certificate is also known as an SAN- or UCC (Unified Communications Certificate) certificate.

Guidelines for Generating Certificate Chain and Private Key using OpenSSL On the configuration host, navigate to the directory where the certificate file is required to be placed. Create a 2048 bit server private key. ... This step is required only when your server private key is not in PKCS#8 format.

How To Generate A CSR for Multi-Domain SSL Certificates? Create a copy of OpenSSL config file. ... Edit the config file and enable [ v3_req ] ... Enable SubjectAltName under [ v3_req ] section. ... Add Alt Name or SAN names in the config file. ... Generate the private key. ... Generate the CSR for multi-domain or SAN certificate. ... Test the CSR.

The common name can only contain up to one entry: either a wildcard or non-wildcard name. It's not possible to specify a list of names covered by an SSL certificate in the common name field. The Subject Alternative Name extension (also called Subject Alternate Name or SAN) was introduced to solve this limitation.

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.