In: Categories » Internet » Web design and development » VeriSign Recommendations for Implementing SSL on Multiple Servers
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Let’s look at some common shared certificate configurations for an e-commerce trust infrastructure: Fail-safe backup: Redundant servers, not used simultaneously. Load balancing: Multiple sites with different common names on multiple servers. Load balancing: Multiple sites with the same common name on multiple servers. ISP shared SSL: One certificate issued to an ISP’s domain, used on multiple servers by multiple Web sites. Name-based virtual hosting: An ISP or Web Host provides each hosted customer with a unique domain name, such as customername.isp.com[1]. Fail-Safe BackupCertificate sharing is permissible. However, when the backup server is not under the same control as the primary server, the private key cannot be adequately protected, and a separate certificate should be used for each server. Load Balancing: Multiple Sites with Different Common NamesTo prevent browsers from detecting that the URL of the site visited differs from the common name in the certificate, a different certificate should be used for each server/domain name combination. A different certificate should also be used to protect the security of private keys. Load Balancing: Multiple Sites with the Same Common NameInstead of jeopardizing private key functionality by copying the key for multiple servers, a different certificate should be used for each server. Each certificate may have the same common name and organizational name, but slightly different organizational unit values. ISP Shared SSLISP shared SSL prevents site visitors from verifying that the site they are visiting is the same as the site protected by the certificate and listed in the certificate itself. Each site’s server should have its own certificate. Or, merchants must inform their customers that site encryption is provided by the ISP, not the merchant, and the ISP must guarantee the services of all the hosted companies whose sites use shared SSL. Name-Based Virtual HostingIf the same certificate is used for each domain name, browsers will indicate that the site domain name does not match the common name in the certificate. To solve this problem, a “wildcard” certificate of the form *.isp.com is required to properly serve the multi-hostname configuration without creating browser mismatch error messages.
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