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Article ID : # Last review : 2009-04-08 00:00:00

What is a Wildcard certificate

  Unlike normal vertificates that protect only a single named host such as '', or '', a wildcard certificate can protect '*'. This means that the certificate can also be used for all the subdomains for a single domain. This is a great time and cost saver if you have multiple host names that need protecting.

Please check the compatibility of your applications before using a wildcard certificate. Whilst most modern browsers and devices do support wildcard certificates, there are a few applications, ISA server, Outlook Mobile access etc that in the past have not supported this well.


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