I have a sub domain from
no-ip.org. I would like to get a free SSL certifcate for my domain. Is this even possible to do for a subdomain and if so what are my options?
closed as off-topic by random♦ Feb 12 '14 at 22:55
This question appears to be off-topic. The users who voted to close gave this specific reason:
There are at least three options for using a certificate with a web or mail server:
Option 1: Obtain an SSL certificate signed by a certificate authority (CA)
The advantage of using a certificate signed by a CA is that your visitors will automatically trust your certificate. Operating systems and web browsers ship with a list of trusted root certificates, and only certificates signed by those trusted certificates are considered trusted by default.
The disadvantage, of course, is that to my knowledge all the CAs included with major operating systems and browsers charge money for their services.
CAs do offer certificates for subdomains; however, they generally have some sort of simple verification process to prove you have control of that subdomain. Different CAs may have different policies about issuing certs for subdomains of no-ip.org and other dynamic DNS providers.
A small list of potential CAs you might investigate are:
Option 2: Obtain an SSL certificate from a web-of-trust provider
The only web-of-trust provider I'm aware of is CAcert.org. This is a certificate authority that provides free SSL certificates. However, the certificates do not verify anything about your domain until enough other CAcert.org users have verified your identity. Once you've earned enough "assurance points", you can add a name to your certificate and have longer expiration dates.
However, I don't believe CAcert.org's root certificate is included in most browsers by default. Your visitors will need to install this root certificate or else they'll get the Scary Certificate Warning:
Option 3: Generate a self-signed certificate
If you really cannot purchase a certificate, you can create a self-signed certificate. This doesn't require any CA, but others computers will not automatically trust your certificate. Guests visiting a website secured by a self-signed certificate will receive the Scary Certificate Warning.
Depending on your system, there are different ways to do this. If you are using OpenSSL, you can use the instructions provided by Akadia.com:
You would then install
You can get a free certificate for subdomains for 90 days from Comodo SSL. This is the only one I've found that is provided by a ubiquitously trusted certificate authority, free, and valid for subdomains. I've personally used it with my free domain provided by no-ip. Unfortunately it's only valid for 90 days, after that it's $100/year (or less for a multi-year commitment).