Publish Subdomain in Server App Red Button

Hi folks.

I'm trying to publish subdirectories as subdomains. i.e.:

myadomain.com/alpha/ => alpha.mydomain.com

The first version works, the latter I'm having trouble publishing.

OS X Mountain Lion Server, in the Server.app.

I've published one of them, and it works, but with a red light to the right. I try to publish another, and it doesn't work.

Very strange.

Any advice?

Cheers