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DNS Name Matches SAN, but getting SSL_ERROR_BAD_CERT_DOMAIN in Firefox Only

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Hey friends,

I'm experiencing an issue with Firefox only (Edge and Chrome are fine) with a specific site/certificate and was hoping someone had some advice.

The site in question is github.ourcompany.com, which has a certificate issued with the following:

Subject Common Name: *.github.ourcompany.com

And the following Subject Alt Names: DNS: *.github.ourcompany.com DNS: *.github DNS: github.ourcompany.com DNS: github IP: 10.x.x.x

When I browse to https://github.ourcompany.com, I get a SSL_ERROR_BAD_CERT_DOMAIN message, even though github.ourcompany.com is a valid SAN. I'm wondering if this is to do with validation rules regarding wildcard SANs, or perhaps the order of the SANs. Has anyone seen this before?

Hey friends, I'm experiencing an issue with Firefox only (Edge and Chrome are fine) with a specific site/certificate and was hoping someone had some advice. The site in question is github.ourcompany.com, which has a certificate issued with the following: Subject Common Name: *.github.ourcompany.com And the following Subject Alt Names: DNS: *.github.ourcompany.com DNS: *.github DNS: github.ourcompany.com DNS: github IP: 10.x.x.x When I browse to https://github.ourcompany.com, I get a SSL_ERROR_BAD_CERT_DOMAIN message, even though github.ourcompany.com is a valid SAN. I'm wondering if this is to do with validation rules regarding wildcard SANs, or perhaps the order of the SANs. Has anyone seen this before?

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