Subdomain Mapping Tool on 3.0

We’ve got a test install of WPMU 3.0 at cloudcarbon.com, with some test subdomains that we are planning on transferring to a WPMU community. Keeping it up to the minute every day or so with svn.

With only a couple of IP addresses to hand using CNAME and the Domain Mapping tool to map mapmonkey.co.uk (on 123-reg.co.uk) to maps.cloudcarbon.com on our dedicated server.

www CNAME maps.cloudcarbon.com.

PROBLEM: mapmonkey.co.uk resolves to a plesk default page

the subdomains, e.g. maps.cloudcarbon.com work fine

It is a Plesk installation and the vhost conf file:

<VirtualHost 89.16.161.220:80>
ServerName cloudcarbon.com:80
ServerAlias *.cloudcarbon.com
UseCanonicalName Off
ServerAdmin “”
DocumentRoot /var/www/vhosts/cloudcarbon.com/httpdocs
CustomLog /var/www/vhosts/cloudcarbon.com/statistics/logs/access_log plesklog
ErrorLog /var/www/vhosts/cloudcarbon.com/statistics/logs/error_log
<IfModule mod_userdir.c>

(Another problem is that if any operation is performed on vhost file via Plesk (updates, DNS modification), and the *.cloudcarbon.com reverts to www)

We’ve played with various CNAME combinations and finding it hard to figure out what might be wrong.

Anyone like to point out what is so obviously wrong that we are missing it or to do to troubleshoot?

Many thanks

Philip