All subdomains suddently redirect to parent site?

[psygarden]

I'm having this new and strange problem, it seems that a part of my configuration is no longer active...

I have a number of subdomains configured that where running perfectly before, and now after some system maintenance all the subdomains display the parent/htdocs website instead of the parent/subdomain/htdocs/ content

I checked the dns entry and it's unaltered, but don't quite know what might be causing this issue?

Strange detail: admin.server.com does still work, but all other subdomains are no longer working.

all help is appreciated!

greetings,
Rik