![]() Microsoft CA) and issue certificates from there. So what can you do if you want to secure communications between your internal servers that use internal server names? Well, you can’t use a publicly trusted SSL Certificate, so one option is to use self-signed certificates, or set-up an in-house CA (e.g. many companies may have an internal mail system at the address: For more explanation on the dangers of internal names in public SSL Certificates, check out our white paper. In short, this is because these names are not unique and are used internally, so there is no way for a CA to verify that the company owns it (e.g. 10.0.0.0, 172.16.0.0, 192.168.0.0)Īs of November, 2015, CAs are prohibited from issuing publicly trusted SSL Certificates containing internal server names or reserved IPs. ![]() Any IPv4 address in the RFC 1918 range (e.g.NetBIOS names or short hostnames, anything without a public domain.Any server name with a non-public domain name suffix (e.g.An internal name is a domain or IP address that is part of a private network, for example: ![]() If your domain isn’t registered, you’re likely talking about an internal server name. Registering your domain is an essential step for setting up a public site, so the odds are, if you’re looking to secure a public website at least, you’ve already got this step taken care of and can move on to Step 2. This is because Certificate Authorities (CAs), the organizations that issue certificates, need to verify domain ownership. Step 1 - Is Your Domain Registered?įirst things first, you need to register your domain before you can obtain a publicly trusted SSL Certificate (meaning the kind you need for public websites, more on this below). While the infographic provides a great high level overview of the main options for certificates and provides some examples for each, we tend to get a lot of questions on this, so I thought some further explanation would be helpful.īelow I’ll take you through the steps to take in selecting an SSL Certificate, as suggested by the CASC, with some additional context to help frame your decisions. The CA Security Council (CASC), an advocacy group committed to the advancement of online security that we joined in 2013, recently published a handy infographic – What Kind of SSL/TLS Certificate Do I Need? (check it out below this post).
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