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I'm trying to redirect users to a subdomain in server2 if they make an https request to server1. I only have one certificate, and that's installed on server2.

So for instance, from (server1) https://www.example.com to (server2) https://ssl.example.com

My best guess is that I will need a certificate for https://www.example.com as the hostname is encrypted inside the HTTP header so my server won't know to redirect until it's decrypted. However, I'm curious if this is possible without two certificates?

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up vote 1 down vote accepted

Yes, it is possible with one certificate, it just needs to have two subjectAltName parameters, one for www.example.com and ssl.example.com. I do wonder why you would redirect someone to an SSL-specific subdomain if you've already got them using SSL on the main domain...

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Mainly I was thinking in the case that a user types https://www.example.com. If they follow the links within www.example.com, then it will automatically send them to ssl.example.com. My other question would be, server1 is a name based server (virtualhosts) (1 IP), so using SAN could create conflicts/warnings between the other sites. is that correct? –  Sean K. Jul 8 '12 at 5:17
Why have ssl.example.com at all, though? Why not just run all your SSL through www.example.com, if you've got a cert for it. You'll have conflicts with other name-based virtual hosts on the same IP regardless of whether you're using sAN; there's no way to avoid that. –  womble Jul 8 '12 at 5:22
I agree with you, using only www would be the way to go. Thanks! –  Sean K. Jul 8 '12 at 5:38

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