First off some foundations, unlike SBS Standard you either need to park the url under vanityname.remotewebaccess.com or you need to buy a SSL cert. But the wizard assumes that you will want to buy your SSL cert from the domain vendor you have your domain name parked under …and well sometimes you don’t do that.
So what’s an SBS-E to do?
How to Install Your Existing Certificate into SBS Essentials – The Official SBS Blog – Site Home – TechNet Blogs:
http://blogs.technet.com/b/sbs/archive/2011/08/04/how-to-install-your-existing-certificate-into-sbs-essentials.aspx
Follow that blog to take ANY third party SSL cert you’ve purchased and install it on your SBS 2011 Essential Server.
I’ll post it up on the www.sbsbuilddoc.com so we won’t forget it.
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For very detailed information on a NEW SSL certificate for SBS 2011 Essentials, Rob has a great blog post
http://titlerequired.com/2011/07/15/setting-up-remote-web-access-on-sbs-2011-essentials-part-2/