That's really three questions:
1) Check the Site properties make sure it is set to port 443 for "secure
port" and that port 80 is also present in the host headers. (On the same
tab.)
1a) For the error message, check this site see if it helps;
http://weblogs.asp.net/owscott/archive/2006/01/26/436607.aspx
2) In the host headers, add the IP address and the hostname "domainname.com"
for port 80. (It won't work in secured mode unless you got a wildcard
certificate or two certificates and run a separate virtual web.) Then,
configure DNS for "domainname.com" just like you did for
"www.domainname.com"
"asleepatdesk" <steve RemoveThis @scoleman.net> wrote in message
news:7f118cc1-66f6-407f-8b8b-a5c9a86a35d3@q78g2000hsh.googlegroups.com...
> Hi,
>
> I am maintaining a new site and have two IIS 6.0 questions:
>
> 1) A SSL certificate is installed on the site, so when you browse to
> https://www.domainname.com (secure), the user reaches the site OK.
> But when the user browses to http://www.domainname.com, I get a Server
> Unavailable page and the following error is logged to the Event
> Viewer: "It is not possible to run two different versions of ASP.NET
> in the same IIS process. Please use the IIS Administration Tool to
> reconfigure your server to run the application in a separate process."
>
> I can't figure out what is happening here and what to do to fix.
>
> 2) How do I configure IIS to accept http://domainname.com and
> https://domainname.com ? (no 'www')
>
> Thanks for you help.
> asleep