Apache https crashes when ServerName set correctly

Apache https crashes when ServerName set correctly

I have a problem with my server :/
Following environment: - Windows Server 2008 RC2 - IIS handles one website
- Apache handles two 3rd party administration tools and an SVN repo -
HTTPS in Apache - IIS without HTTPS
Now the problem: The certificate seem to be installed "correctly" because
the sites that are handled by apache can be accessed through HTTPS. But
when we try to access SVN through HTTPS we get an error from the JDK that
says "the hostname that is send through the https protocol does not match
the remote server name".
And thats correctly, because in the httpd.conf the ServerName is set to
localhost. The problem now is, if I set the ServerName to the correct
value, the site does not respond anymore. The apache errorlog does only
say "child process exited unexpectedly with exitcode 255". That it seems
like apache tries to restart the child over and over again, but everytime
it fails with that message. Also in debug mode there are not more specific
information.
Does anyone have an idea what could be the problem?
Thanks in advance