apache 2.2 - SSL on multiple subdomains with the same IP

I installed a wildard SSL certificate on our server on
which we will run multiple subdomains. So I created sub1.domain.com, sub2.domain.com,
etc.

I created several vhost files ( etc) and
set NameVirtualHost *:443. So far all subdomains are running on a SSL connection. No
problems arised. Every subdomains sees his own content and all browsers work
perfect.

Is this a correct way to set-up SSL on
multiple subdomains? I know you should set an IP per domain with SSL, but what about
subdomains? This seems to run without
trouble.

That was my first question. My second
question is the fact I received an error after libssl has been updated on my ubuntu
server. Apache didn't start anymore and gave me the
error:

[error] Server should be SSL-aware but has no certificate configured [Hint:
SSLCertificateFile]
((null):0)

It
sound something is wrong, but everything worked perfect the last month. As a fix I found
that you can add "http" after the listen in ports.conf, like
this:

Listen 443
http

It
doesn't look like a real solution to me. Anyone else knows what exactly is
wrong?

So,
question 1: Is my SSL
setup a correct/legal setup?
question 2: What's this error above all
about?

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