多域名SSL证书, 也称为Multi SAN SSL, 是指一张证书可以保护多个域名，这样在证书的管理和续费上都能带来很大的便利。在一个多域名证书中，要求域名所有者相同。数字证书的验证签发方式跟具体签发的证书类型相关。 多域名SSL证书是Microsoft Exchange邮件服务器加密首选证书类型。
多域名SSL/TLS 证书和其他 SSL 提供的加密服务相同，但可以保护多个网站。因此，您可以使用一个 SAN 证书保障 LilysBikes.com、LilysBikeShop.com 和 Lilys.bike 的安全。您的客户提交到其中的任意一个网站的信息都将获得安全保护。这些类证也称为多域名或统一通信证书 (UCC) SSL。这种功能为客户提供了非常大的使用弹性，它使您可以创建一张易于使用和安 装，却又比通配符SSL 证书更安全，完全适合您服务器安全需求的SSL证书。支持如：Microsoft Exchange Server 2003、Microsoft Exchange 2007 、Microsoft Exchange server2012和 Microsoft Office Communications Sever 2007之类的最新技术的安全应用。多个顶级域名（FQDNS） ，如您的公司使用不同的顶级域名。
多域名SSL证书有三种验证等级： DV SSL证书（域名验证）、OV SSL证书（组织验证）和EV SSL证书（扩展验证）。适合拥有多个不同域名的用户申请安装
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A Multi-Domain SAN certificate allows you to - as its name implies - secure many domain names and wildcard SANs under one SSL certificate. They take advantage of certificate Subject Alternative Names or SANs. SANs are additional domain names included in a single SSL certificate that a browser accepts as trusted. With a single Multi-Domain SSL certificate you can secure...
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Multi-Domain SAN certificates allow you to bind multiple service endpoints to a single IP address eliminating the hassle and headaches of trying to stitch together multiple single-domain certificates.
Unlike Wildcard certificates which only work for one base domain, a Multi-Domain certificate allows you to secure more than one base domain. You can secure coke.com, pepsi.net, yahoo.info and autodiscover.microsoft.co.uk all on one SSL certificate.
Buying, installing, monitoring and renewing multiple SSL certificates can be challenging and time consuming. You have got betting things to do. Using a Multi-Domain SAN certificate reduces your total cost of ownership by consolidating certificate-management time down to a single certificate.
Ordinarily hosting SSL websites on a single server requires a unique, non-shared IP for each virtual host. With a Multi-Domain SAN certificate you can easily host multiple HTTPS virtual hosts using just a single IP address.
With our Multi-Domain certificates you're free to add new domains, edit existing domains or delete domains that you're no longer using over the life of the certificate. You can, for instance, start with just a few domains and a few weeks or months later add more domains and delete others.
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Certs only require you to demonstrate proof of domain-control by email, DNS, or file authentication, validation team will help you get all done.