Self-Signed SSL: Subject Alternative Name (SAN) are not respected by my web browsers

ssl self-signed-certificate

I have created a self-signed certificate that works with https://*.blah.com (for example www.blah.com works). I have blah.com listed as a SAN but https://blah.com doesn't work with my web browser.

What's wrong with my cert?

Here's a screenshot of the error:

enter image description here


I don't think you added the SAN value properly to your cert. It's not just a string field in the Subject. It's a separate extension that would be listed further down in the cert details like this: enter image description here

Additionally as Rob-d mentioned, the error message the browser gave you is basically telling you that your Common Name (CN) field is invalid (probably because you tried to add an invalid field to the Subject called "Subject Alternative Name").

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