Posted this problem on the WordPress MU Domain Mapping Forum, waiting on a response so repeating here and will update this post with the solution (assuming I find one).

Trying to setup a test WordPress Mapped installation on a couple of domains I’m not currently using (talian-theme.co.uk - IP 146.255.35.9 and stallion-theme.co.uk - IP 146.255.35.63) using WordPress multisite with the WordPress MU Domain Mapping Plugin.

Have WordPress multisite with sub-domains working on talian-theme.co.uk.

Have installed the WordPress MU Domain Mapping Plugin and think the only step remaining is changing DNS settings correctly.

Running a Godaddy virtual server with three IPs that are shared for my other domains, I use Virtualmain as the control panel and for the .co.uk domains for the test are registered with Fasthosts and Fasthosts don’t appear to have domain parking (other than showing their ads). If I can’t get this working will try with .com’s that are registered with Godaddy, but do need to work this out for .co.uk domains as well as plan to move most of my WordPress sites (about 90 and a fair number are .co.uk) to a handful of mapped setups (it’s a MASSIVE pain updating ~90 WordPress installs!!!).

Have the main WordPress multisite setup on talian-theme.co.uk have working subdomains (so WordPress multisite is working)

Two test sub-domains without mapping them to a domain.
test.talian-theme.co.uk Hello post install
virtual-light.talian-theme.co.uk Imported posts from another site

At the time of this test both worked.

Primary domain set to: stallion-theme.co.uk associated sub-domain stallionthemecouk.talian-theme.co.uk (hello post install) loaded what you’d expect (stallion-theme.co.uk loaded “Apache 2 Test Page” and stallionthemecouk.talian-theme.co.uk loaded the hello install) before changing DNS settings on the two domains.

Reasonably confident everything up to this point is working as expected.

After associating stallionthemecouk.talian-theme.co.uk and stallion-theme.co.uk they both loaded stallion-theme.co.uk (“Apache 2 Test Page” loads so the redirection is working but mapping isn’t).

This is where I start to run into issues.

As I’ve been trying various DNS settings there might be some caching issues, I keep getting other domains on the server loading (virtual-light.com, almohare.com or redrosewriting.com** - basically the default domains for the three IPs used on the server), when it isn’t getting the wrong cache the “Apache 2 Test Page” loads.

** The current DNS settings below appear to be loading redrosewriting.com which is the default domain for the IP 146.255.35.63 (IP also used for talian-theme.co.uk) so definetly got something wrong.

Have wildcard sub-domains set and working on talian-theme.co.uk

Added a CNAME (suspect I got this wrong) and this is the DNS settings from Virtualmin.

talian-theme.co.uk

$ttl 38400
@ IN SOA ip-46-252-194-69.ip.secureserver.net. root.ip-46-252-194-69.ip.secureserver.net. (
1331382265
10800
3600
604800
38400 )
@ IN NS ip-46-252-194-69.ip.secureserver.net.
talian-theme.co.uk. IN A 146.255.35.9
www.talian-theme.co.uk. IN A 146.255.35.9
ftp.talian-theme.co.uk. IN A 146.255.35.9
m.talian-theme.co.uk. IN A 146.255.35.9
localhost.talian-theme.co.uk. IN A 127.0.0.1
webmail.talian-theme.co.uk. IN A 146.255.35.9
admin.talian-theme.co.uk. IN A 146.255.35.9
mail.talian-theme.co.uk. IN A 146.255.35.9
talian-theme.co.uk. IN MX 5 mail.talian-theme.co.uk.
talian-theme.co.uk. IN TXT "v=spf1 a mx a:talian-theme.co.uk ip4:46.252.194.69 ip4:146.255.35.9 ?all"
*.talian-theme.co.uk. IN A 146.255.35.9
stallionthemecouk.talian-theme.co.uk. IN CNAME stallion-theme.co.uk.

All settings except the last two are defaults, the CNAME at the bottom is my attempt to associate the subdomain with stallion-theme.co.uk.

stallion-theme.co.uk

$ttl 38400
@ IN SOA ip-46-252-194-69.ip.secureserver.net. root.ip-46-252-194-69.ip.secureserver.net. (
1339810076
10800
3600
604800
38400 )
@ IN NS ip-46-252-194-69.ip.secureserver.net.
stallion-theme.co.uk. IN A 146.255.35.63
www.stallion-theme.co.uk. IN A 146.255.35.63
ftp.stallion-theme.co.uk. IN A 146.255.35.63
m.stallion-theme.co.uk. IN A 146.255.35.63
localhost.stallion-theme.co.uk. IN A 127.0.0.1
webmail.stallion-theme.co.uk. IN A 146.255.35.63
admin.stallion-theme.co.uk. IN A 146.255.35.63
mail.stallion-theme.co.uk. IN A 146.255.35.63
stallion-theme.co.uk. IN MX 5 mail.stallion-theme.co.uk.
stallion-theme.co.uk. IN TXT "v=spf1 a mx a:stallion-theme.co.uk ip4:46.252.194.69 ip4:146.255.35.63 ?all"

The above are all defaults.

I’m not sure what to do with the DNS settings for stallion-theme.co.uk

Currently under Fasthosts control panel I’ve got the nameservers set to

ns1.stallion-theme.co.uk 146.255.35.63
ns2.stallion-theme.co.uk 146.255.35.63

This is all I have to set to use a new domain normally.

talian-theme.co.uk has the following nameservers

ns1.talian-theme.co.uk 146.255.35.9
ns2.talian-theme.co.uk 146.255.35.9

I can add new A and CNAME entries under Fasthosts control panel, but not sure what to add?

Will update with solutions.

David Law : AKA SEO Dave, Search Engine Optimization Consultant, Internet Marketer, WordPress SEO Theme Developer and Nice Guy :-)

Google Plus WordPress MU Domain Mapping Plugin DNS Settings? Facebook WordPress MU Domain Mapping Plugin DNS Settings? Twitter WordPress MU Domain Mapping Plugin DNS Settings? Linkedin WordPress MU Domain Mapping Plugin DNS Settings? StumbleUpon WordPress MU Domain Mapping Plugin DNS Settings? WordPress SEO Themes YouTube Channel RSS Feed
Website - WordPress SEO